Document And Entity Information (USD $)	12 Months Ended
Document And Entity Information (USD $)	Apr. 30, 2015	Jul. 21, 2015	Oct. 31, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	FREQUENCY ELECTRONICS INC
Document Type	10-K
Current Fiscal Year End Date	--04-30
Entity Common Stock, Shares Outstanding		8,715,877
Entity Public Float			$ 67,700,000
Amendment Flag	false
Entity Central Index Key	0000039020
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	Apr. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY

Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Current assets:
Cash and cash equivalents	$ 7,222	$ 7,698
Marketable securities	11,186	16,030
Accounts receivable, net of allowance for doubtful accounts of $189 in 2015 and $234 in 2014	9,689	7,741
Costs and estimated earnings in excess of billings, net	12,929	10,439
Inventories, net	38,239	41,227
Deferred and prepaid income taxes	3,063	3,433
Prepaid expenses and other	1,271	1,294
Total current assets	83,599	87,862
Property, plant and equipment, at cost, net of accumulated depreciation and amortization	12,686	11,240
Deferred income taxes	7,360	6,650
Goodwill and other intangible assets	617	689
Cash surrender value of life insurance and cash held in trust	11,825	11,321
Other assets	1,738	1,699
Total assets	117,825	119,461
Current liabilities:
Accounts payable - trade	1,720	2,336
Accrued liabilities	6,630	7,361
Total current liabilities	8,350	9,697
Long-term debt - noncurrent	6,000	10,100
Deferred compensation	11,318	10,724
Deferred rent and other liabilities	347	594
Total liabilities	26,015	31,115
Commitments and contingencies
Stockholders' equity:
Preferred stock, $1.00 par value authorized 600 shares, no shares issued
Common stock, $1.00 par value; authorized 20,000 shares, 9,164 shares issued and 8,699 outstanding in 2015; 8,571 outstanding in 2014	9,164	9,164
Additional paid-in capital	54,360	53,181
Retained earnings	27,528	24,702
	91,052	87,047
Common stock reacquired and held in treasury - at cost (465 shares in 2015 and 593 shares in 2014)	(2,132)	(2,715)
Accumulated other comprehensive income	2,890	4,014
Total stockholders' equity	91,810	88,346
Total liabilities and stockholders' equity	$ 117,825	$ 119,461

Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Allowance for doubtful accounts (in Dollars)	$ 189	$ 234
Preferred stock, par value (in Dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized	600	600
Preferred stock, shares issued	0	0
Common stock, par value (in Dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized	20,000	20,000
Common stock shares issued	9,164	9,164
Common stock, shares outstanding	8,699	8,571
Treasury stock, shares	465	593

Consolidated Statements of Income and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Revenues	$ 76,564	$ 71,550
Cost of revenues	53,016	46,800
Gross margin	23,548	24,750
Selling and administrative expenses	14,207	14,064
Research and development expenses	5,666	5,813
Operating profit	3,675	4,873
Other income (expense):
Investment income	1,042	880
Interest expense	(139)	(156)
Other (expense) income, net	(42)	703
Income before provision for income taxes	4,536	6,300
Provision for income taxes	1,710	2,260
Net income	2,826	4,040
Net income per common share:
Basic (in Dollars per share)	$ 0.33	$ 0.47
Diluted (in Dollars per share)	$ 0.32	$ 0.46
Average shares outstanding:
Basic (in Shares)	8,610,950	8,526,576
Diluted (in Shares)	8,909,758	8,816,957
Consolidated Statements of Comprehensive Income
Net Income	2,826	4,040
Foreign currency translation adjustment	(1,093)	505
Change in market value of marketable securities before reclassification, net of tax of ($176) and $130	343	(162)
Reclassification adjustment for realized gains included in net income, net of tax of $192 and $125	(374)	(242)
Total unrealized loss on marketable securities, net of tax	(31)	(404)
Total other comprehensive (loss) income	(1,124)	101
Comprehensive income	$ 1,702	$ 4,141

Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Cash flows from operating activities:
Net income	$ 2,826	$ 4,040
Adjustments to reconcile net income to net cash provided in operating activities:
Deferred income tax benefit	(720)	(160)
Depreciation and amortization	2,944	2,471
Deferred lease obligation	(81)	120
Provision for losses on accounts receivable, inventories and warranty reserve	222	254
Gains on marketable securities	(566)	(367)
Loss (gain) on sale of fixed and other assets, net	64	(667)
Employee benefit plans expense	1,516	1,246
Stock-based compensation expense	1,077	1,105
Tax benefit from exercise of stock-based compensation	(200)	(182)
Changes in operating assets and liabilities:
Accounts receivable	(3,206)	491
Costs and estimated earnings in excess of billings	(2,490)	(2,122)
Inventories	1,267	(3,102)
Prepaid expenses and other	42	423
Other assets	(529)	(703)
Accounts payable - trade	25	614
Accrued liabilities	(339)	(88)
Income taxes refundable/payable	594	688
Other liabilities	(564)	(419)
Net cash provided by operating activities	1,882	3,642
Cash flows from investing activities:
Purchase of marketable securities	(1,956)	(3,162)
Proceeds from sale or redemption of marketable securities	7,271	4,993
Capital expenditures	(4,157)	(5,405)
Net cash provided by (used in) investing activities	1,158	(3,574)
Cash flows from financing activities:
Proceeds from credit line borrowing	2,300	4,100
Payment of short-term credit and lease obligations	(6,400)	(15)
Tax benefit from exercise of stock-based compensation	200	182
Net cash (used in) provided by financing activities	(3,900)	4,267
Net (decrease) increase in cash and cash equivalents before effect of exchange rate changes	(860)	4,335
Effect of exchange rate changes on cash and cash equivalents	384	(97)
Net (decrease) increase in cash and cash equivalents	(476)	4,238
Cash and cash equivalents at beginning of year	7,698	3,460
Cash and cash equivalents at end of year	7,222	7,698
Cash paid during the year for:
Interest	140	153
Income taxes	$ 1,851	$ 1,735

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Apr. 30, 2013	$ 9,164,000	$ 51,913,000	$ 20,662,000	$ (3,200,000)	$ 3,913,000	$ 82,452,000
Balance (in Shares) at Apr. 30, 2013	9,163,940			700,590
Contribution of stock to 401(k) plan		277,000		189,000		466,000
Contribution of stock to 401(k) plan (in Shares)				(41,775)
Stock-based compensation expense		1,104,000		1,000		1,105,000
Stock-based compensation expense (in Shares)				(300)
Tax benefit from stock option exercise		182,000				182,000
Exercise of stock options and stock appreciation rights - net of		(295,000)		295,000
Exercise of stock options and stock appreciation rights - net of (in Shares)				(65,384)		(196,000)
Change in unrealized gains and losses on marketable securities, net of taxes					(404,000)	(404,000)
Foreign currency translation adjustment					505,000	505,000
Net Income			4,040,000			4,040,000
Balance at Apr. 30, 2014	9,164,000	53,181,000	24,702,000	(2,715,000)	4,014,000	88,346,000
Balance (in Shares) at Apr. 30, 2014	9,163,940			593,131		8,571,000
Contribution of stock to 401(k) plan		302,000		183,000		485,000
Contribution of stock to 401(k) plan (in Shares)				(40,324)
Stock-based compensation expense		1,072,000		5,000		1,077,000
Stock-based compensation expense (in Shares)				(1,400)		58,000
Tax benefit from stock option exercise		200,000				200,000
Exercise of stock options and stock appreciation rights - net of		(395,000)		395,000
Exercise of stock options and stock appreciation rights - net of (in Shares)				(86,244)		(205,500)
Change in unrealized gains and losses on marketable securities, net of taxes					(31,000)	(31,000)
Foreign currency translation adjustment					(1,093,000)	(1,093,000)
Net Income			2,826,000			2,826,000
Balance at Apr. 30, 2015	$ 9,164,000	$ 54,360,000	$ 27,528,000	$ (2,132,000)	$ 2,890,000	$ 91,810,000
Balance (in Shares) at Apr. 30, 2015	9,163,940			465,163		8,699,000

1. Summary of Accounting Policies

12 Months Ended

Apr. 30, 2015

Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

1. Summary of Accounting Policies

Principles of Consolidation:

The consolidated financial statements include the accounts of Frequency Electronics, Inc. and its wholly-owned subsidiaries (the "Company" or "Registrant"). References to “FEI” are to the parent company alone and do not refer to any of its subsidiaries. The Company is principally engaged in the design, development and manufacture of precision time and frequency control products and components for microwave integrated circuit applications. See Note 13 for information regarding the Company’s FEI-NY (which includes the subsidiaries FEI Government Systems, Inc., FEI Communications, Inc., Frequency Electronics, Inc. Asia (“FEI-Asia”) and FEI-Elcom Tech, Inc. (“FEI-Elcom”)), Gillam-FEI, and FEI-Zyfer business segments. Intercompany accounts and significant intercompany transactions are eliminated in consolidation. To accommodate the different fiscal periods of Gillam-FEI, the Company recognizes its share of net income or loss on a one month lag. Any material events which may occur during the intervening month at Gillam-FEI will be accounted for in the consolidated financial statements.

These financial statements have been prepared in conformity with United States generally accepted accounting principles (“U.S. GAAP”) and require management to make estimates and assumptions that affect amounts reported and disclosed in the financial statements and related notes. Actual results could differ from these estimates.

Reclassifications:

Certain prior year amounts have been reclassified to conform to current year presentation. These reclassifications had no effect on reported consolidated earnings.

Cash Equivalents:

The Company considers certificates of deposit and other highly liquid investments with maturities of three months or less when purchased to be cash equivalents. The Company places its temporary cash investments with high credit quality financial institutions. Such investments may be in excess of the FDIC insurance limit. No losses have been experienced on such investments.

Marketable Securities:

Marketable securities consist of investments in common stocks, including exchange-traded funds, corporate debt securities and debt securities of U.S. Government agencies. All marketable securities were held in the custody of financial institutions; three and four institutions at April 30, 2015 and 2014, respectively. Investments in debt and equity securities are categorized as available for sale and are carried at fair value, with unrealized gains and losses excluded from income and recorded directly to stockholders' equity. The Company recognizes gains or losses when securities are sold using the specific identification method.

Allowance for Doubtful Accounts:

Losses from uncollectible accounts receivable are provided for by utilizing the allowance for doubtful accounts method based upon management’s estimate of uncollectible accounts. Management analyzes accounts receivable and the potential for bad debts, customer concentrations, credit worthiness, current economic trends and changes in customer payment terms when evaluating the amount recorded for the allowance for doubtful accounts.

Property, Plant and Equipment:

Property, plant and equipment are recorded at cost and include interest on funds borrowed to finance construction. Expenditures for renewals and betterments are capitalized; maintenance and repairs are charged to income when incurred. When fixed assets are sold or retired, the cost and related accumulated depreciation and amortization are eliminated from the respective accounts and any gain or loss is credited or charged to income.

If events or changes in circumstances indicate that the carrying amount of a long-lived asset may not be recoverable, the Company estimates the future cash flows expected to result from the use of the asset and its eventual disposition. If the sum of the expected future cash flows (undiscounted and without interest charges) is less than the carrying amount of the long-lived asset, an impairment loss is recognized. To date, no impairment losses have been recognized.

Inventories:

Inventories, which consist of finished goods, work-in-process, raw materials and components, are accounted for at the lower of cost (specific and average) or market.

Depreciation and Amortization:

Depreciation of fixed assets is computed on the straight-line method based upon the estimated useful lives of the assets (40 years for buildings and 3 to 10 years for other depreciable assets). Leasehold improvements and equipment acquired under capital leases are amortized on the straight-line method over the shorter of the term of the lease or the useful life of the related asset.

Amortization of identifiable intangible assets is based upon the expected lives of the assets and is recorded at a rate which approximates the Company’s utilization of the assets.

Intangible Assets:

Intangible assets consist of the ISO 9000 certification arising from the acquisition of FEI-Elcom in the assignment of fair value to its acquired assets including intangibles. The certification is valued at fair value and was amortized over the estimated useful life of 3 years from the date of acquisition.

Goodwill:

The Company records goodwill as the excess of purchase price over the fair value of identifiable net assets acquired. Goodwill is tested for impairment on at least an annual basis at year end. When it is determined that the carrying value of goodwill may not be recoverable, the Company writes down the goodwill to an amount commensurate with the revised value of the acquired assets. The Company measures impairment based on revenue projections, recent transactions involving similar businesses and price/revenue multiples at which they were bought and sold, price/revenue multiples of competitors, and the present market value of publicly-traded companies in the Company’s industry.

Revenue and Cost Recognition:

Revenues under larger, long-term contracts, which generally require billings based on achievement of milestones rather than delivery of product, are reported in operating results using the percentage of completion method. For U.S. Government and other fixed-price contracts that require initial design and development of the product, revenue is recognized on the cost-to-cost method. Under this method, revenue is recorded based upon the ratio that incurred costs bear to total estimated contract costs with related cost of sales recorded as the costs are incurred. Costs and estimated earnings in excess of billings on uncompleted contracts, net of billings on uncompleted contracts in excess of costs and estimated earnings, are included in current assets.

On production-type orders, revenue is recorded as units are delivered with the related cost of sales recognized on each shipment based upon a percentage of estimated final program costs.

Changes in job performance on long-term and production-type orders may result in revisions to costs and revenue and are recognized in the period in which revisions are determined to be required. Provisions for the full amount of anticipated losses are made in the period in which they become determinable.

For customer orders in the Company’s subsidiaries, and smaller contracts or orders in the other business segments, sales of products and services to customers are reported in operating results upon shipment of the product or performance of the services pursuant to terms of the customer order.

Contract costs include all direct material, direct labor costs, manufacturing overhead and other direct costs related to contract performance. Selling, general and administrative costs are charged to expense as incurred.

In accordance with industry practice, inventoried costs contain amounts relating to contracts and programs with long production cycles, a portion of which will not be realized within one year. Program costs for which production-level orders cannot be determined as probable are written down in the period in which that assessment is made.

Comprehensive Income:

Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes changes in unrealized gains or losses, net of tax, on securities available for sale during the year and the effects of foreign currency translation adjustments.

Research and Development expenses:

The Company engages in research and development activities to identify new applications for its core technologies, to improve existing products and to improve manufacturing processes to achieve cost reductions and manufacturing efficiencies. Research and development costs include direct labor, manufacturing overhead, direct materials and contracted services. Such costs are expensed as incurred.

Income Taxes:

The Company recognizes deferred tax liabilities and assets based on the expected future tax consequences of events that have been included in the financial statements or tax returns. Under this method, deferred tax liabilities and assets are determined based on the difference between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are established and adjusted when necessary to increase or reduce deferred tax assets to the amount expected to be realized.

The Company analyzes its tax positions under accounting standards which prescribe recognition thresholds that must be met before a tax benefit is recognized in the financial statements and provides guidance on de-recognition, classification, interest and penalties, accounting in interim periods, disclosure, and transition. An entity may only recognize or continue to recognize tax positions that meet a "more likely than not" threshold. When and if the Company were to recognize interest or penalties related to income taxes, it would be reported net of the federal tax benefit in the tax provision.

Earnings Per Share:

Basic earnings per share are computed by dividing net earnings by the weighted average number of shares of common stock outstanding. Diluted earnings per share are computed by dividing net earnings by the sum of the weighted average number of shares of common stock and the if-converted effect of unexercised stock options and stock appreciation rights.

Fair Values of Financial Instruments:

Cash and cash equivalents and short-term credit obligations are reflected in the accompanying consolidated balance sheets at amounts considered by management to reasonably approximate fair value based upon the nature of the instrument and current market conditions. Management is not aware of any factors that would significantly affect the value of these amounts. The Company also has an investment in a privately-held company, Morion, Inc. (“Morion”). The Company is unable to reasonably estimate a fair value for this investment.

Foreign Operations and Foreign Currency Adjustments:

The Company maintains manufacturing operations in Belgium and the People’s Republic of China. The Company is vulnerable to currency risks in these countries. The local currency is the functional currency of each of the Company’s non-U.S. subsidiaries. No foreign currency gains or losses are recorded on intercompany transactions since they are effected at current rates of exchange. The results of operations of foreign subsidiaries, when translated into U.S. dollars, reflect the average rates of exchange for the periods presented. The balance sheets of foreign subsidiaries, except for equity accounts which are translated at historical rates, are translated into U.S. dollars at the rates of exchange in effect on the date of the balance sheet. As a result, similar results in local currency can vary upon translation into U.S. dollars if exchange rates fluctuate significantly from one period to the next.

Equity-based Compensation:

The Company values its share-based payment transactions using the Black-Scholes valuation model. Such value is recognized as expense on a straight-line basis over the service period of the awards, which is generally the vesting period, net of estimated forfeitures.

The weighted average fair value of each option or stock appreciation right (“SAR”) has been estimated on the date of grant using the Black-Scholes option pricing model with the following range of weighted average assumptions used for grants:

	Years ended April 30
	2015			2014
Expected volatility		35	%		34	%
Dividend yield		0.0	%		0.0	%
Risk-free interest rate	1.50% and 2.38		%	2.45% to 2.50		%
Expected lives	5.0 and 8.5 years			8.5 years

The expected life assumption was determined based on the Company’s historical experience as well as the term of recent SAR agreements. The expected volatility assumption was based on the historical volatility of the Company’s common stock. The dividend yield assumption was determined based upon the Company’s past history of dividend payments and the Company’s current decision to suspend payment of dividends. The risk-free interest rate assumption was determined using the implied yield currently available for zero-coupon U.S. Government issues with a remaining term equal to the expected life of the stock options or SARs.

Concentration of Credit Risk

Financial instruments, which potentially subject the Company to concentration of credit risk, consist principally of cash and cash equivalents and trade receivables. The Company maintains accounts at several commercial banks at which the balances exceed Federal Deposit Insurance Corporation limits. The Company has not experienced any losses on such amounts. Concentration of credit risk with respect to trade receivables is generally diversified due to the large number of entities comprising the Company’s customer base and their dispersion across geographic areas principally within the United States. The Company routinely addresses the financial strength of its customers and, as a consequence, believes that its receivable credit risk exposure is limited. The Company does not require customers to post collateral.

New Accounting Pronouncements:

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 eliminates most of the existing industry-specific revenue recognition guidance and significantly expands related disclosures. The required disclosures will include both quantitative and qualitative information about the amount, timing and uncertainty of revenue from contracts with customers and the significant judgments used. Entities can retrospectively apply ASU 2014-09 or use an alternative transition method. In July 2015, the FASB approved a one-year deferral of the effective date of this ASU. Although the amending ASU has not yet been issued, since it will be amended, this ASU is effective for public companies for annual reporting periods beginning on or after December 15, 2017 and for the Company, must be adopted for its fiscal year 2019 beginning on May 1, 2018. The Company is in the process of determining the effect that ASU 2014-09 may have on its financial statements.

3. Costs and Estimated Earnings in Excess of Billings

12 Months Ended

Apr. 30, 2015

Contractors [Abstract]

Long-term Contracts or Programs Disclosure [Text Block]

3. Costs and Estimated Earnings in Excess of Billings

At April 30, 2015 and 2014, costs and estimated earnings in excess of billings, net, consist of the following:

	2015			2014
	(in thousands)
Costs and estimated earnings in excess of billings	$	14,057		$	11,965
Billings in excess of costs and estimated earnings		(1,128	)		(1,526	)
Net asset	$	12,929		$	10,439

Such amounts represent revenue recognized on long-term contracts that had not been billed at the balance sheet dates or represent a liability for amounts billed in excess of the revenue recognized. Amounts are billed to customers pursuant to contract terms. In general, the recorded amounts will be billed and collected or revenue recognized within twelve months of the balance sheet date. Revenue on these long-term contracts is accounted for on the percentage of completion basis. During the years ended April 30, 2015 and 2014, revenue recognized under percentage of completion contracts was approximately $46.8 million and $43.2 million, respectively. If contract losses are anticipated, costs and estimated earnings in excess of billings are reduced for the full amount of such losses when they are determinable. Total anticipated contract losses at April 30, 2015 were approximately $400,000. No anticipated losses existed at April 30, 2014.

5. Property, Plant and Equipment and Leases

12 Months Ended

Apr. 30, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

5. Property, Plant and Equipment and Leases

Property, plant and equipment at April 30, 2015 and 2014, consists of the following (in thousands):

	2015		2014
Buildings and building improvements	$	5,224	$	5,976
Machinery, equipment and furniture		52,987		49,651
		58,211		55,627
Less, accumulated depreciation		45,525		44,387
	$	12,686	$	11,240

Depreciation and amortization expense for the years ended April 30, 2015 and 2014 was $2,828,000 and $2,309,000, respectively.

Maintenance and repairs charged to operations for the years ended April 30, 2015 and 2014 was approximately $1,017,000 and $940,000, respectively.

The Company leases its Long Island, New York headquarters building at an annual rent of $800,000 following the Company’s exercise of its option to renew the lease for a second 5-year period. The lease will end in January 2019. Under the terms of the lease, the Company is required to pay its proportionate share of real estate taxes, insurance and other charges.

In addition, the Company’s subsidiaries in New Jersey, China, France and California lease their office and manufacturing facilities. FEI-Elcom leases 32,000 square feet of office and manufacturing space at current monthly rental of approximately $28,000 through the end of the lease which expires in March 2016. The lease for the FEI-Asia facility is for a one-year term with monthly rent of $6,800 through February 2016. FEI-Zyfer leases office and manufacturing space encompassing 27,850 square feet. Monthly rental payments are currently $30,400 and increase each year over the remaining 28 months of the lease term. Satel-FEI, a wholly-owned subsidiary of Gillam-FEI, occupies office space under a 9-year lease, cancelable after three years, at an approximate rate of $1,000 per month.

Rent expense under operating leases was approximately $1.5 million for both fiscal years ended April 30, 2015 and 2014. The Company records rent expense on its New York building and FEI-Zyfer facility on the straight-line method over the lives of the respective leases. As a result, as of April 30, 2015 and 2014, the Company’s balance sheet includes deferred rent payable of approximately $290,000 and $380,000, respectively, which will be recognized over the respective rental periods.

Future minimum lease payments required by the operating leases are as follows (in thousands):

Years ending April 30,	Operating Leases
2016	$	1,484
2017		1,174
2018		925
2019		600
Total future minimum lease payments	$	4,183

6. Marketable Securities

12 Months Ended

Apr. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

6. Marketable Securities

The cost, gross unrealized gains, gross unrealized losses and fair market value of available-for-sale securities at April 30, 2015 and 2014 are as follows (in thousands):

	April 30, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Fixed income securities	$	3,379	$	104	$	(16	)	$	3,467
Equity securities		7,018		834		(133	)		7,719
	$	10,397	$	938	$	(149	)	$	11,186

	April 30, 2014
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Fixed income securities	$	8,927	$	116	$	(36	)	$	9,007
Equity securities		6,267		909		(153	)		7,023
	$	15,194	$	1,025	$	(189	)	$	16,030

The following table presents the fair value and unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous unrealized loss position:

	Less than 12 months					12 Months or more					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
April 30, 2015
Fixed Income Securities	$	96	$	(1	)	$	461	$	(15	)	$	557	$	(16	)
Equity Securities		3,323		(133	)		-		-			3,323		(133	)
	$	3,419	$	(134	)	$	461	$	(15	)	$	3,880	$	(149	)
April 30, 2014
Fixed Income Securities	$	501	$	(3	)	$	448	$	(33	)	$	949	$	(36	)
Equity Securities		366		(1	)		925		(152	)		1,291		(153	)
	$	867	$	(4	)	$	1,373	$	(185	)	$	2,240	$	(189	)

The Company regularly reviews its investment portfolio to identify and evaluate investments that have indications of possible impairment. The Company does not believe that its investments in marketable securities with unrealized losses at April 30, 2015 are other-than-temporary due to market volatility of the security’s fair value, analysts’ expectations and the Company’s ability to hold the securities for a period of time sufficient to allow for any anticipated recoveries in market value.

Proceeds from the sale or redemption of available-for-sale securities and the resulting gross realized gains and losses included in the determination of net income (loss) are as follows (in thousands):

	For the years ended April 30,
	2015			2014
Proceeds	$	7,271		$	4,993
Gross realized gains	$	571		$	367
Gross realized losses	$	(5	)	$	-

Maturities of fixed income securities classified as available-for-sale at April 30, 2015 are as follows (at cost, in thousands):

Current	$	251
Due after one year through five years		1,308
Due after five years through ten years		1,820
	$	3,379

The fair value accounting framework provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurements) and the lowest priority to unobservable inputs (level 3 measurements).

The three levels of the fair value hierarchy are described below:

Level 1 Inputs to the valuation methodology are unadjusted quoted prices for identical assets or liabilities in active markets that the Company has the ability to access.

Level 2 Inputs to the valuation methodology include:

- Quoted prices for similar assets or liabilities in active markets;

- Quoted prices for identical or similar assets or liabilities in inactive markets

- Inputs other than quoted prices that are observable for the asset or liability;

- Inputs that are derived principally from or corroborated by observable market data by correlation or other means.

Level 3 Inputs to the valuation methodology are unobservable and significant to the fair value measurement.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used need to maximize the use of observable inputs and minimize the use of unobservable inputs. All of the Company’s investments in marketable securities are Level 1 assets.

7. Debt Obligations	12 Months Ended
7. Debt Obligations	Apr. 30, 2015
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	7. Debt Obligations On June 6, 2013, the Company obtained a credit facility (the “Facility”) from JPMorgan Chase Bank, N.A. (“JPMorgan”) pursuant to a credit agreement (the “Credit Agreement”) between the Company and JPMorgan. The maximum aggregate amount of the Facility is $25.0 million. Proceeds from the Facility will be used for working capital and to finance acquisitions. During the year ended April 30, 2015, the Company borrowed an additional $2.3 million under the Facility primarily to finance the acquisition of additional manufacturing equipment and repaid an aggregate of $6.4 million from its operating cash flow and as a result of redemptions of certain fixed income marketable securities. The Company may make borrowings under the Facility, from either Tranche A or Tranche B or a combination of both, not to exceed $25.0 million. Pursuant to the Credit Agreement, the amount of Tranche A borrowings may not exceed the value of the Pledged Investments (as defined in the Credit Agreement). The amount of Tranche B borrowings may not exceed the lesser of (i) $15.0 million and (ii) the Borrowing Base (as defined in the Credit Agreement). Current outstanding borrowings under the Facility are all under Tranche A. The Facility is fully guaranteed by certain of the Company’s subsidiaries and is secured by, among other things, a pledge of substantially all personal property of the Company and certain of the Company’s subsidiaries. Borrowings under the Facility are evidenced by a line of credit note (the “Note”) and bear interest, payable monthly, at a rate equal to the LIBOR Rate, as determined from time to time by JPMorgan pursuant to the terms of the Note, plus a margin of 0.75% for Tranche A borrowings and 1.75% for Tranche B borrowings. At April 30, 2015 and 2014, the rate was 0.9305% and 1.235%, respectively, based on the one-month LIBOR rate. The principal balance on the Note, along with any accrued and unpaid interest, is due and payable no later than June 5, 2018, which is the maturity date of the Facility. In addition, the Company is required to pay JPMorgan fees equal to 0.1% per annum on any unused portion of the Facility. The Credit Agreement contains a number of affirmative and negative covenants, including limitations on the incurrence of additional debt, liens on property, acquisitions, loans and guarantees, mergers, consolidations, liquidations and dissolutions, asset sales, and distributions and other payments in respect of the Company’s capital stock. The Credit Agreement also contains certain events of default customary for credit facilities of this type, including nonpayment of principal or interest when due, material incorrectness of representations and warranties when made, breach of covenants, bankruptcy and insolvency, unstayed material judgment beyond specified periods, and acceleration or payment default of other material indebtedness. The Credit Agreement requires the Company to maintain, as of the end of each fiscal quarter, a funded debt to EBITDA (Earnings Before Interest, Taxes, Depreciation and Amortization) ratio and, if there are any borrowings under Tranche B, an interest charge coverage ratio. The calculation of both ratios is defined in the Credit Agreement. For the year ended April 30, 2015, the Company met the required covenants for its borrowings under Tranche A. The Company’s European subsidiaries have available 250,000 Euros (approximately $275,000 based on current rates of exchange between the dollar and the Euro) in a bank credit line to meet short-term cash flow requirements. As of April 30, 2015 and 2014, no amounts were outstanding under such line of credit. Borrowings under the bank credit line, if any, must be repaid within one year of receipt of funds. Interest on this credit line is at 1.0% over the EURO Interbank Offered rate (EURIBOR). At April 30, 2015 and 2014, the rate was 1.12% and 1.235%, respectively, based on the one-month EURIBOR.

9. Investment in Morion, Inc.	12 Months Ended
9. Investment in Morion, Inc.	Apr. 30, 2015
Investment Holdings [Abstract]
Investment Holdings [Text Block]	9. Investment in Morion, Inc. The Company has an investment in Morion, Inc., a privately-held Russian company, which manufactures high precision quartz resonators and crystal oscillators. The Company’s investment consists of 4.6% of Morion’s outstanding shares, accordingly, the Company accounts for its investment in Morion on the cost basis. This investment is included in other assets in the accompanying balance sheets. During the fiscal years ended April 30, 2015 and 2014, the Company acquired product from Morion in the aggregate amount of approximately $201,000 and $213,000, respectively, and the Company sold product to Morion in the aggregate amount of approximately $615,000 and $1,044,000, respectively. At April 30, 2015, accounts receivable included $145,000 due from Morion and $23,000 was payable to Morion. On October 22, 2012, the Company entered into an agreement with respect to its licensing of rubidium oscillator production technology to Morion. The agreement requires the Company to supply production equipment and parts and to provide training to Morion employees to enable Morion to achieve certain levels of volume production of rubidium oscillators. Morion will pay the Company approximately $2.7 million for the license, the equipment, parts and training, plus 5% royalties on third party sales. For a 5-year period following an initial production run, the Company commits to purchase from Morion a minimum of approximately $400,000 worth of rubidium oscillators per year although Morion is not obligated to sell that amount to the Company. In November 2012, Morion paid the Company a $925,000 deposit under the agreement which amount had been recorded on the Company’s balance sheet as deferred revenue. In October 2013, after amending the original document to clarify certain billing events, the Company invoiced Morion for the equipment, certain component parts for the production of rubidium oscillators, training of certain Morion employees and transfer of the production technology and license to Morion. Accordingly, during the year ended April 30, 2014, the Company recorded revenues of $500,000 for the technology transfer, training and sale of parts and recognized a gain of approximately $736,000 upon the sale of fully-depreciated equipment. The $925,000 deposit previously recorded as deferred revenue is included in these revenues and gain. During fiscal year 2015, no revenue was recorded under this agreement. In future years. additional revenues under the agreement will be recorded after the Company provides further on-site training for Morion personnel, delivers more component parts and obtains relief from certain U.S. Government limitations relating to the sales of items to be manufactured under the license. The United States Department of State has approved the technology transfer called for under the agreement.

11. Employee Benefit Plans

12 Months Ended

Apr. 30, 2015

Disclosure Text Block Supplement [Abstract]

Compensation and Employee Benefit Plans [Text Block]

11. Employee Benefit Plans

Profit Sharing Plan:

The Company provides its U.S.-based employees with a profit sharing plan and trust under section 401(k) of the Internal Revenue Code. This plan allows all eligible employees to defer a portion of their income through voluntary contributions to the plan. In accordance with the provisions of the plan, the Company can make discretionary matching contributions in the form of cash or common stock. For the years ended April 30, 2015 and 2014, the Company contributed 40,324 and 41,775 shares of common stock, respectively. The approximate value of these shares at the date of contribution was $485,000 in fiscal year 2015 and $466,000 in fiscal year 2014. Contributed shares are drawn from the Company’s common stock held in treasury and are removed at the Company’s original cost of acquisition of such shares on a specific identification basis. In addition to changes in the treasury stock accounts, during fiscal years 2015 and 2014, such transactions increased additional paid in capital by $302,000 and $277,000, respectively. As of April 30, 2015, the profit sharing plan holds an aggregate of 467,975 shares of the Company’s common stock allocated to the accounts of the individual participants. Subsequent to the end of fiscal year 2015, the ESOP Plan (see below) was merged into the Company’s profit sharing plan. All shares of the Company’s common stock held by the two plans were combined for an aggregate holding of 853,601 shares in the profit sharing plan.

Income Incentive Pool:

The Company maintains incentive bonus programs for certain employees which are based on operating profits of the individual subsidiaries to which the employees are assigned. The Company also adopted a plan for the President and Chief Executive Officer of the Company, which formula is based on consolidated pre-tax profits. Under these plans the Company charged approximately $1.3 million to selling and administrative expenses for both fiscal years ended April 30, 2015 and 2014.

Employee Stock Plans:

The Company has various stock plans, some of which have been approved by the Company’s stockholders, for key management employees, including officers and directors who are employees, certain consultants and independent members of the Board of Directors. The plans are Nonqualified Stock Options (“NQSO”) plans, Incentive Stock Option ("ISO”) plans and Stock Appreciation Rights (“SARS”). Under these plans, options or SARS are granted at the discretion of the Stock Option Committee at an exercise price not less than the fair market value of the Company's common stock on the date of grant.

Typically, options and SARS vest over a four-year period from the date of grant. The options and SARS generally expire ten years after the date of grant (the most recent SAR award expires in five years) and are subject to certain restrictions on transferability of the shares obtained on exercise. Under the Company’s 2005 Stock Award Plan (“Plan”) the Company provided option holders the opportunity to exercise stock options either by paying the exercise price for the shares or to do a cashless exercise whereby the individual receives the net number of shares of stock equal in value to the exercised number of shares times the difference between the current market value of the Company’s stock and the exercise price. Under the Plan, instruments granted under other plans which expire, are canceled, or are tendered in the exercise of such instruments, increase the shares available under the Plan.

As of April 30, 2013, a consultant, who is the son of the Company’s president, had been granted options to purchase 37,500 shares of Company stock under NQSO plans at a weighted average exercise price of $6.67. During the years ended April 30, 2015 and 2014, the consultant elected cashless exercises of 20,000 shares and 17,500 shares, respectively, at an exercise price of $6.67, resulting in a net issuance of 8,638 shares in fiscal year 2015 and 7,276 shares in fiscal year 2014. As of April 30, 2015, the consultant has no outstanding stock options. At the beginning of fiscal year 2015, eligible employees had been granted options to purchase approximately 172,500 shares of which 95,000 options with a weighted average exercise price of $13.15 were outstanding and exercisable. During the year ended April 30, 2015, 57,000 options expired and were returned to the Plan. The remaining 38,000 shares were exercised by the employees using the cashless method resulting in the net issuance of 6,931 shares of Company stock. Total fiscal year 2015 cashless exercises of stock options under ISO and NQSO plans, including the consultant shares above, aggregated 58,000 shares. Accordingly, the Company issued 15,569 shares on exercise and returned 42,431 shares to the pool of available shares which may be used for future grants under the Plan. As of April 30, 2015, eligible employees and directors have been granted SARS based on approximately 1,950,000 shares of Company stock, of which approximately 1,603,000 shares are outstanding and approximately 1,131,000 shares with a weighted average exercise price of $8.27 are exercisable. When the SARS become exercisable, the Company will settle the SARS by issuing to exercising recipients the number of shares of stock equal to the appreciated value of the Company’s stock between the grant date and exercise date. At the time of exercise, the quantity of shares under the SARS grant equal to the exercise value divided by the then market value of the shares will be returned to the pool of available shares for future grant under the Plan. During the year ended April 30, 2015, employees exercised SARS representing 147,500 shares of Company stock and received 70,675 shares of Company stock. The 76,825 share difference was returned to the pool of available shares and may be used for future grants.

The excess of the consideration received over the par value of the common stock or cost of treasury stock issued under both types of option plans is recognized as an increase in additional paid-in capital.

The following table summarizes information about stock option and stock appreciation rights activity for the years ended April 30:

	Stock Options and Stock Appreciation Rights
	Shares			Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding – April 30, 2013		1,708,625		$	8.23	6.1 years
Granted		212,000			10.30
Exercised		(196,000	)		7.16
Expired or Canceled		(2,000	)		10.06
Outstanding – April 30, 2014		1,722,625		$	8.60	6.0 years
Granted		145,000			13.02
Exercised		(205,500	)		7.72
Expired or Canceled		(59,000	)		14.32
Outstanding – April 30, 2015		1,603,125		$	8.90	5.8 years	$	6,952,378
Exercisable		1,131,375		$	8.27	4.8 years	$	5,619,840
Available for future grants		71,572

As of April 30, 2015, total unrecognized compensation cost related to nonvested options and stock appreciation rights under the plans was approximately $1,071,000. These costs are expected to be recognized over a weighted average period of 1.5 years.

During the years ended April 30, 2015 and 2014, 244,625 and 268,875 shares, respectively, vested, the fair value of which was approximately $1,053,000 and $993,000, respectively. The weighted average grant date fair value of stock appreciation rights granted during the years ended April 30, 2015 and 2014, were approximately $4.45 and $4.57, respectively.

Stock-based compensation costs capitalized as part of work in process inventory or included in the cost of sales of programs on which the Company recognizes revenue under the percentage of completion method were approximately $394,000 and $426,000 for the years ended April 30, 2015 and 2014, respectively. Selling and administrative expenses include stock-based compensation expense of approximately $683,000 and $679,000 for the years ended April 30, 2015 and 2014, respectively.

The Company classifies cash flows resulting from the tax benefits from tax deductions recognized upon the exercise of stock options or SARS (tax benefits) as financing cash flows. For the years ended April 30, 2015 and 2014, the Company realized $200,000 and $182,000 respectively, of tax benefits from the exercise of stock options and SARS.

Independent Contractor Stock Option Plan:

The Company had an Independent Contractor Stock Option Plan under which up to 350,000 shares could be granted. This plan was terminated in fiscal year 2006. An Independent Contractor Stock Option Committee determined to whom options may be granted from among eligible participants, the timing and duration of option grants, the option price, and the number of shares of common stock subject to each option. Options were granted to certain independent contractors at a price equal to the then fair market value of the Company’s common stock. The options were exercisable over specified periods per terms of the individual agreements. No compensation expense was recorded during the years ended April 30, 2015 and 2014 as no other grants were made in those years and previous grants have been fully expensed. As a result of the adoption by the stockholders of the 2005 Stock Award Plan, the Independent Contractor Stock Option Plan was discontinued. No additional grants will be made under this plan and the outstanding grant of an option for 30,000 shares at an exercise price of $14.76 expired during fiscal year 2015.

Restricted Stock Plan:

During fiscal year 1990, the Company adopted a Restricted Stock Plan which provided that key management employees could be granted rights to purchase an aggregate of 375,000 shares of the Company's common stock. The grants, transferability restrictions and purchase price were determined at the discretion of a special committee of the board of directors. The purchase price could not be less than the par value of the common stock. Transferability of shares is restricted for a four-year period, except in the event of a change in control as defined. As a result of the adoption by the Company’s stockholders of the 2005 Stock Award Plan, the Restricted Stock Plan was discontinued. No additional grants will be made under this plan. As of April 30, 2015 and 2014, grants for 7,500 shares are available to be purchased at a price of $4.00 per share.

Employee Stock Ownership Plan/Stock Bonus Plan:

During 1990, the Company amended its Stock Bonus Plan to become an Employee Stock Ownership Plan (“ESOP”). By means of a bank note, subsequently repaid, the Company reacquired 561,652 shares of its common stock during fiscal year 1990. These shares plus approximately 510,000 additional shares issued by the Company from its authorized, unissued shares were sold to the ESOP in May 1990. Shares were released for allocation to participants based on a formula as specified in the ESOP document. By the end of fiscal year 2000, all shares (1,071,652) had been allocated to participant accounts of which 385,626 shares remain in the ESOP. Subsequent to the end of fiscal year 2015, the ESOP plan was merged into the Company’s profit sharing plan.

Deferred Compensation Agreements:

The Company has a series of agreements with key employees providing for the payment of benefits upon retirement or death. Under these agreements, each key employee receives specified retirement payments for the remainder of the employee's life with a minimum payment of ten years' benefits to either the employee or his beneficiaries. The agreements also provide for lump sum payments upon termination of employment without cause and reduced benefits upon early retirement. The Company pays the benefits out of its working capital, but has also purchased whole life or term life insurance policies on the lives of certain of the participants to cover the optional lump sum obligations of the agreements upon the death of the participant. Deferred compensation expense charged to selling and administrative expenses during the years ended April 30, 2015 and 2014 was approximately $1,038,000 and $780,000, respectively.

Life Insurance Policies and Cash Held in Trust:

The whole-life insurance policies on the lives of certain participants covered by deferred compensation agreements have been placed in a trust. Upon the death of any insured participant, cash received from life insurance policies in excess of the Company’s deferred compensation obligations to the estate or beneficiaries of the deceased, are also placed in the trust. These assets belong to the Company until a change of control event, as defined in the trust agreement, should occur. At that time, the Company is required to add sufficient cash to the trust so as to match the deferred compensation liability described above. Such funds will be used to continue the deferred compensation arrangements following a change of control.

12. Income Taxes

12 Months Ended

Apr. 30, 2015

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

12. Income Taxes

The income before provision for income taxes consisted of (in thousands):

	Year Ended April 30,
	2015			2014
U.S.	$	6,201		$	7,565
Foreign		(1,665	)		(1,265	)
	$	4,536		$	6,300

The provision for income taxes consists of the following (in thousands):

	2015			2014
Current:
Federal	$	2,170		$	2,190
Foreign		-			-
State		260			230
Current provision		2,430			2,420
Deferred:
Federal		(560	)		(280	)
Foreign		(630	)		(103	)
State		(290	)		120
Deferred benefit		(1,480	)		(263	)
Change in valuation allowance		760			103
Total provision	$	1,710		$	2,260

The following table reconciles the reported income tax expense with the amount computed using the federal statutory income tax rate (in thousands):

	2015			2014
Computed "expected" tax expense	$	1,542		$	2,142
State and local tax, net of federal benefit		(126	)		214
Valuation allowance on deferred tax assets		760			103
Foreign losses without tax benefit		73			222
Nondeductible expenses		112			199
Nontaxable life insurance cash value increase		(119	)		(151	)
Tax credits		(191	)		(203	)
Other items, net, none of which individually exceeds 5% of federal taxes at statutory rates		(341	)		(266	)
	$	1,710		$	2,260

The components of deferred taxes are as follows (in thousands):

	2015			2014
Deferred tax assets:
Employee benefits	$	7,400		$	6,860
Inventory		1,580			1,750
Accounts receivable		570			570
Tax credits		860			770
Other liabilities		200			240
Net operating loss carryforwards		3,230			3,130
Total deferred tax asset		13,840			13,320
Deferred tax liabilities:
Marketable securities		270			280
Property, plant and equipment		820			1,050
Net deferred tax asset		12,750			11,990
Valuation allowance		(2,390	)		(2,120	)
Net deferred tax assets	$	10,360		$	9,870

Net deferred tax assets are comprised of the following (in thousands):

	2015			2014
Gross current assets	$	3,350		$	3,600
Valuation allowance		-			-
Current liabilities		(350	)		(380	)
Net current deferred tax assets		3,000			3,220

Gross noncurrent assets		10,700			9,940
Valuation allowance		(2,390	)		(2,120	)
Noncurrent liabilities		(950	)		(1,170	)
Net noncurrent deferred tax assets		7,360			6,650
Net deferred tax assets	$	10,360		$	9,870

The total valuation allowance relates to deferred tax assets of both domestic and foreign subsidiaries. The change in valuation allowance during the year ended April 30, 2015 was an increase of $270,000, which consists of the $760,000 deferred tax provision less a foreign exchange adjustment of $490,000. For the year ended April 30, 2014, the change in valuation allowance was an increase of $220,000 which consists of the $103,000 deferred tax provision plus a foreign exchange adjustment of $117,000.

At April 30, 2015, the Company has available approximately $4.2 million in net operating losses available to offset future income of certain of its foreign subsidiaries. These loss carryforwards have no expiration date. As a result of the acquisition of FEI-Elcom, the Company has a federal net operating loss carryforward of $5.1 million which may be applied in annually limited amounts to offset future U.S.-sourced taxable income over the next 17 years.

The Company has evaluated its tax positions and has concluded that the tax positions meet the more-likely-than-not recognition threshold as specified under accounting standards. It is difficult to predict what would occur to change the Company’s unrecognized tax benefits over the next twelve months. The Company believes, however, that there should be no change during the next twelve months.

13. Segment Information

12 Months Ended

Apr. 30, 2015

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

13. Segment Information

The Company operates under three reportable segments based on the geographic locations of its subsidiaries:

(1)

FEI-NY – operates out of New York and its operations consist principally of precision time and frequency control products used in three principal markets- communication satellites (both commercial and U.S. Government-funded); terrestrial cellular telephone or other ground-based telecommunication stations and other components and systems for the U.S. military.

(2)	Gillam-FEI - operates out of Belgium and France and primarily sells wireline synchronization and network management systems in non-U.S. markets. All sales from Gillam-FEI to the United States are to other segments of the Company.

(3)

FEI-Zyfer – operates out of California and its products incorporate Global Positioning System (GPS) technologies into systems and subsystems for secure communications, both government and commercial, and other locator applications. This segment also provides sales and support for the Company’s wireline telecommunications family of products, including US5G, which are sold in the United States market.

The FEI-NY segment also includes the operations of the Company’s wholly-owned subsidiaries, FEI-Elcom and FEI-Asia. FEI-Asia functions as a manufacturing facility for the FEI-NY segment with historically minimal sales to outside customers. Beginning in late fiscal year 2014, FEI-Asia began shipping higher volumes of product to third parties as a contract manufacturer. FEI-Elcom, in addition to its own product line, provides design and technical support for the FEI-NY segment’s satellite business.

The Company’s Chief Executive Officer measures segment performance based on total revenues and profits generated by each geographic location rather than on the specific types of customers or end-users. Consequently, the Company determined that the segments indicated above most appropriately reflect the way the Company’s management views the business.

The accounting policies of the three segments are the same as those described in the “Summary of Significant Accounting Policies.” The Company evaluates the performance of its segments and allocates resources to them based on operating profit which is defined as income before investment income, interest expense and taxes. The European-based director of Gillam-FEI and the president of FEI-Zyfer manage the assets of these segments. All acquired assets, including intangible assets, are included in the assets of these two segments.

The table below presents information about reported segments for each of the years ended April 30 with reconciliation of segment amounts to consolidated amounts as reported in the statement of operations or the balance sheet for each of the years (in thousands):

	2015			2014
Net revenues:
FEI-NY	$	61,905		$	55,772
Gillam-FEI		8,026	**		9,995	**
FEI-Zyfer		9,215			7,990
less intersegment revenues		(2,582	)**		(2,207	)**
Consolidated revenues	$	76,564		$	71,550

Operating profit (loss):
FEI-NY	$	4,809		$	6,403
Gillam-FEI		(1,706	)**		(520	)**
FEI-Zyfer		961			(626	)
Corporate		(389	)		(384	)
Consolidated operating profit	$	3,675		$	4,873

**For fiscal years ended April 30, 2015 and 2014, includes Gillam-FEI intersegment sales of $1.5 million and $1.6 million, respectively, to the FEI-NY and FEI-Zyfer segments. Such sales consist principally of design and development of automatic test equipment for satellite hardware production and manufacture of assemblies and units of a wireline synchronization product for ultimate production and sale in the U.S. In the Gillam-FEI segment, these transactions reduced the operating loss in each of the fiscal years.

	2015			2014
Identifiable assets:
FEI-NY (approximately $3 million in China)	$	63,541		$	62,969
Gillam-FEI (all in Belgium or France)		9,878			19,595
FEI-Zyfer		11,088			11,220
less intersegment receivables		(8,775	)		(19,819	)
Corporate		42,093			45,496
Consolidated identifiable assets	$	117,825		$	119,461

Depreciation and amortization (allocated):
FEI-NY	$	2,562	$	2,021
Gillam-FEI		208		261
FEI-Zyfer		159		174
Corporate		15		15
Consolidated depreciation and amortization expense	$	2,944	$	2,471

Major Customers

The Company's products are sold to both commercial and governmental customers. For the years ended April 30, 2015 and 2014, approximately 47% and 54% respectively, of the Company's sales were made under contracts to the U.S. Government or subcontracts for U.S. Government end-use.

In fiscal year 2015, sales to three customers of the FEI-NY segment aggregated $33.1 million or 53% of that segment’s total sales. Each of these customers also exceeded 10% of the Company’s consolidated revenues. During the year ended April 30, 2015, in the Gillam-FEI segment, sales to one customer exceeded 10% of that segment’s revenues. In the FEI-Zyfer segment, two customers accounted for more than 10% of that segment’s sales. None of the customers in the Gillam-FEI and FEI-Zyfer segments accounted for more than 10% of consolidated revenues.

In fiscal year 2014, sales to two customers of the FEI-NY segment aggregated $29.4 million or 53% of that segment’s total sales. Each of these customers also exceeded 10% of the Company’s consolidated revenues. During the year ended April 30, 2014, in the Gillam-FEI segment, sales to one customer exceeded 10% of that segment’s revenues. In the FEI-Zyfer segment, one customer accounted for more than 10% of that segment’s sales. None of the customers in the Gillam-FEI and FEI-Zyfer segments accounted for more than 10% of consolidated revenues.

The loss by the Company of any one of these customers would have a material adverse effect on the Company’s business. The Company believes its relationship with these customers to be mutually satisfactory. Sales to major customers above can include commercial and governmental end users.

Foreign Sales

Revenues in each of the Company’s segments include sales to foreign governments or to companies located in foreign countries. Revenues, based on the location of the procurement entity and excluding intersegment sales, were derived from the following countries:

	(in thousands)
	2015		2014
France	$	10,937	$	8,932
Belgium		3,971		5,719
China		4,493		492
Germany		1,076		60
Russia		638		1,046
Other		2,446		2,428
	$	23,561	$	18,677

15. Other Comprehensive Income (Loss)

12 Months Ended

Apr. 30, 2015

Disclosure Text Block Supplement [Abstract]

Other Comprehensive Income, Noncontrolling Interest [Text Block]

15. Other Comprehensive Income (Loss)

Changes in Accumulated Other Comprehensive Income (“AOCI”) by component and reclassifications out of AOCI are as follows (in thousands):

	Change in Market Value of Marketable Securities						Foreign Currency Translation Adjustment			Total
Balance April 30, 2013, net of taxes				$	1,420		$	2,493		$	3,913
Items of other comprehensive income (loss) before reclassification, pretax					(292	)		505			213
Tax effect					130			-			130
Items of other comprehensive income (loss) before reclassification, net of taxes					(162	)		505			343
Reclassification adjustments, pretax **		(367	)
Tax effect		125			(242	)		-			(242	)
Total other comprehensive income (loss), net of taxes					(404	)		505			101
Balance April 30, 2014, net of taxes					1,016			2,998			4,014
Items of other comprehensive income (loss) before reclassification, pretax					519			(1,093	)		(574	)
Tax effect					(176	)		-			(176	)
Items of other comprehensive income (loss) before reclassification, net of taxes					343			(1,093	)		(750	)
Reclassification adjustments, pretax **		(566	)
Tax effect		192			(374	)		-			(374	)
Total other comprehensive income (loss), net of taxes					(31	)		(1,093	)		(1,124	)
Balance April 30, 2015, net of taxes				$	985		$	1,905		$	2,890

**The reclassification adjustments represent net realized gains on the sale or redemption of available-for-sale marketable securities that were reclassified from AOCI to Other income (expense), net.

Accounting Policies, by Policy (Policies)

12 Months Ended

Apr. 30, 2015

Accounting Policies [Abstract]

Consolidation, Policy [Policy Text Block]

Principles of Consolidation:

Reclassification, Policy [Policy Text Block]

Reclassifications:

Certain prior year amounts have been reclassified to conform to current year presentation. These reclassifications had no effect on reported consolidated earnings.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash Equivalents:

Marketable Securities, Policy [Policy Text Block]

Marketable Securities:

Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]

Allowance for Doubtful Accounts:

Property, Plant and Equipment, Policy [Policy Text Block]

Property, Plant and Equipment:

Inventory, Policy [Policy Text Block]

Inventories:

Inventories, which consist of finished goods, work-in-process, raw materials and components, are accounted for at the lower of cost (specific and average) or market.

Depreciation, Depletion, and Amortization [Policy Text Block]

Depreciation and Amortization:

Amortization of identifiable intangible assets is based upon the expected lives of the assets and is recorded at a rate which approximates the Company’s utilization of the assets.

Intangible Assets, Finite-Lived, Policy [Policy Text Block]

Intangible Assets:

Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]

Goodwill:

Revenue Recognition, Policy [Policy Text Block]

Revenue and Cost Recognition:

On production-type orders, revenue is recorded as units are delivered with the related cost of sales recognized on each shipment based upon a percentage of estimated final program costs.

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income:

Research and Development Expense, Policy [Policy Text Block]

Research and Development expenses:

Income Tax, Policy [Policy Text Block]

Income Taxes:

Earnings Per Share, Policy [Policy Text Block]

Earnings Per Share:

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Values of Financial Instruments:

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Operations and Foreign Currency Adjustments:

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Equity-based Compensation:

	Years ended April 30
	2015			2014
Expected volatility		35	%		34	%
Dividend yield		0.0	%		0.0	%
Risk-free interest rate	1.50% and 2.38		%	2.45% to 2.50		%
Expected lives	5.0 and 8.5 years			8.5 years

Concentration Risk, Credit Risk, Policy [Policy Text Block]

Concentration of Credit Risk

New Accounting Pronouncements, Policy [Policy Text Block]

New Accounting Pronouncements:

6. Marketable Securities (Tables)

12 Months Ended

Apr. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities [Table Text Block]

The cost, gross unrealized gains, gross unrealized losses and fair market value of available-for-sale securities at April 30, 2015 and 2014 are as follows (in thousands):

	April 30, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Fixed income securities	$	3,379	$	104	$	(16	)	$	3,467
Equity securities		7,018		834		(133	)		7,719
	$	10,397	$	938	$	(149	)	$	11,186

	April 30, 2014
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Fixed income securities	$	8,927	$	116	$	(36	)	$	9,007
Equity securities		6,267		909		(153	)		7,023
	$	15,194	$	1,025	$	(189	)	$	16,030

Unrealized Gain (Loss) on Investments [Table Text Block]

The following table presents the fair value and unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous unrealized loss position:

	Less than 12 months					12 Months or more					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
April 30, 2015
Fixed Income Securities	$	96	$	(1	)	$	461	$	(15	)	$	557	$	(16	)
Equity Securities		3,323		(133	)		-		-			3,323		(133	)
	$	3,419	$	(134	)	$	461	$	(15	)	$	3,880	$	(149	)
April 30, 2014
Fixed Income Securities	$	501	$	(3	)	$	448	$	(33	)	$	949	$	(36	)
Equity Securities		366		(1	)		925		(152	)		1,291		(153	)
	$	867	$	(4	)	$	1,373	$	(185	)	$	2,240	$	(189	)

Realized Gain (Loss) on Investments [Table Text Block]

	For the years ended April 30,
	2015			2014
Proceeds	$	7,271		$	4,993
Gross realized gains	$	571		$	367
Gross realized losses	$	(5	)	$	-

Fair Value, by Balance Sheet Grouping [Table Text Block]

Maturities of fixed income securities classified as available-for-sale at April 30, 2015 are as follows (at cost, in thousands):

Current	$	251
Due after one year through five years		1,308
Due after five years through ten years		1,820
	$	3,379

12. Income Taxes (Tables)

12 Months Ended

Apr. 30, 2015

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

The income before provision for income taxes consisted of (in thousands):

	Year Ended April 30,
	2015			2014
U.S.	$	6,201		$	7,565
Foreign		(1,665	)		(1,265	)
	$	4,536		$	6,300

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The provision for income taxes consists of the following (in thousands):

	2015			2014
Current:
Federal	$	2,170		$	2,190
Foreign		-			-
State		260			230
Current provision		2,430			2,420
Deferred:
Federal		(560	)		(280	)
Foreign		(630	)		(103	)
State		(290	)		120
Deferred benefit		(1,480	)		(263	)
Change in valuation allowance		760			103
Total provision	$	1,710		$	2,260

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The following table reconciles the reported income tax expense with the amount computed using the federal statutory income tax rate (in thousands):

	2015			2014
Computed "expected" tax expense	$	1,542		$	2,142
State and local tax, net of federal benefit		(126	)		214
Valuation allowance on deferred tax assets		760			103
Foreign losses without tax benefit		73			222
Nondeductible expenses		112			199
Nontaxable life insurance cash value increase		(119	)		(151	)
Tax credits		(191	)		(203	)
Other items, net, none of which individually exceeds 5% of federal taxes at statutory rates		(341	)		(266	)
	$	1,710		$	2,260

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The components of deferred taxes are as follows (in thousands):

	2015			2014
Deferred tax assets:
Employee benefits	$	7,400		$	6,860
Inventory		1,580			1,750
Accounts receivable		570			570
Tax credits		860			770
Other liabilities		200			240
Net operating loss carryforwards		3,230			3,130
Total deferred tax asset		13,840			13,320
Deferred tax liabilities:
Marketable securities		270			280
Property, plant and equipment		820			1,050
Net deferred tax asset		12,750			11,990
Valuation allowance		(2,390	)		(2,120	)
Net deferred tax assets	$	10,360		$	9,870

	2015			2014
Gross current assets	$	3,350		$	3,600
Valuation allowance		-			-
Current liabilities		(350	)		(380	)
Net current deferred tax assets		3,000			3,220

Gross noncurrent assets		10,700			9,940
Valuation allowance		(2,390	)		(2,120	)
Noncurrent liabilities		(950	)		(1,170	)
Net noncurrent deferred tax assets		7,360			6,650
Net deferred tax assets	$	10,360		$	9,870

13. Segment Information (Tables)

12 Months Ended

Apr. 30, 2015

Segment Reporting [Abstract]

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

	2015			2014
Net revenues:
FEI-NY	$	61,905		$	55,772
Gillam-FEI		8,026	**		9,995	**
FEI-Zyfer		9,215			7,990
less intersegment revenues		(2,582	)**		(2,207	)**
Consolidated revenues	$	76,564		$	71,550

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

Operating profit (loss):
FEI-NY	$	4,809		$	6,403
Gillam-FEI		(1,706	)**		(520	)**
FEI-Zyfer		961			(626	)
Corporate		(389	)		(384	)
Consolidated operating profit	$	3,675		$	4,873

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

	2015			2014
Identifiable assets:
FEI-NY (approximately $3 million in China)	$	63,541		$	62,969
Gillam-FEI (all in Belgium or France)		9,878			19,595
FEI-Zyfer		11,088			11,220
less intersegment receivables		(8,775	)		(19,819	)
Corporate		42,093			45,496
Consolidated identifiable assets	$	117,825		$	119,461

Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block]

Depreciation and amortization (allocated):
FEI-NY	$	2,562	$	2,021
Gillam-FEI		208		261
FEI-Zyfer		159		174
Corporate		15		15
Consolidated depreciation and amortization expense	$	2,944	$	2,471

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	(in thousands)
	2015		2014
France	$	10,937	$	8,932
Belgium		3,971		5,719
China		4,493		492
Germany		1,076		60
Russia		638		1,046
Other		2,446		2,428
	$	23,561	$	18,677

15. Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Apr. 30, 2015

Disclosure Text Block Supplement [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Changes in Accumulated Other Comprehensive Income (“AOCI”) by component and reclassifications out of AOCI are as follows (in thousands):

	Change in Market Value of Marketable Securities						Foreign Currency Translation Adjustment			Total
Balance April 30, 2013, net of taxes				$	1,420		$	2,493		$	3,913
Items of other comprehensive income (loss) before reclassification, pretax					(292	)		505			213
Tax effect					130			-			130
Items of other comprehensive income (loss) before reclassification, net of taxes					(162	)		505			343
Reclassification adjustments, pretax **		(367	)
Tax effect		125			(242	)		-			(242	)
Total other comprehensive income (loss), net of taxes					(404	)		505			101
Balance April 30, 2014, net of taxes					1,016			2,998			4,014
Items of other comprehensive income (loss) before reclassification, pretax					519			(1,093	)		(574	)
Tax effect					(176	)		-			(176	)
Items of other comprehensive income (loss) before reclassification, net of taxes					343			(1,093	)		(750	)
Reclassification adjustments, pretax **		(566	)
Tax effect		192			(374	)		-			(374	)
Total other comprehensive income (loss), net of taxes					(31	)		(1,093	)		(1,124	)
Balance April 30, 2015, net of taxes				$	985		$	1,905		$	2,890

1. Summary of Accounting Policies (Details) - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
1. Summary of Accounting Policies (Details) - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Line Items]
Expected volatility	35.00%	34.00%
Dividend yield	0.00%	0.00%
Expected lives		8 years 6 months
Minimum [Member]
1. Summary of Accounting Policies (Details) - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Line Items]
Risk-free interest rate	1.50%	2.45%
Expected lives	5 years
Maximum [Member]
1. Summary of Accounting Policies (Details) - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Line Items]
Risk-free interest rate	2.38%	2.50%
Expected lives	8 years 6 months

3. Costs and Estimated Earnings in Excess of Billings (Details) - Costs and Estimated Earnings in Excess of Billings, Net (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Costs and Estimated Earnings in Excess of Billings, Net [Abstract]
Costs and estimated earnings in excess of billings	$ 14,057	$ 11,965
Billings in excess of costs and estimated earnings	(1,128)	(1,526)
Net asset	$ 12,929	$ 10,439

4. Inventories (Details) - Schedule of Inventory, Current (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Schedule of Inventory, Current [Abstract]
Raw Materials and Component Parts	$ 24,274	$ 24,986
Work in Progress	9,948	12,385
Finished Goods	4,017	3,856
	$ 38,239	$ 41,227

5. Property, Plant and Equipment and Leases (Details) (USD $)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
5. Property, Plant and Equipment and Leases (Details) [Line Items]
Depreciation	$ 2,828,000	$ 2,309,000
Cost of Property Repairs and Maintenance	1,017,000	940,000
Operating Leases, Rent Expense	1,500,000	1,500,000
Deferred Rent Credit, Noncurrent	290,000	380,000
Long Island, NY Headquarters [Member]
5. Property, Plant and Equipment and Leases (Details) [Line Items]
Operating Leases, Rent Expense, Minimum Rentals	800,000
Lessee Leasing Arrangements, Operating Leases, Renewal Term	5 years
FEI-Elcom Office and Manufacturing Lease [Member]
5. Property, Plant and Equipment and Leases (Details) [Line Items]
Operating Leases, Rent Expense, Minimum Rentals	28,000
Area of Real Estate Property (in Square Feet)	32,000
FEI-Asia Facility Lease [Member]
5. Property, Plant and Equipment and Leases (Details) [Line Items]
Operating Leases, Rent Expense, Minimum Rentals	6,800
Lessee Leasing Arrangements, Operating Leases, Term of Contract	1 year
FEI-Zyfer Office and Manufacturing Leases [Member]
5. Property, Plant and Equipment and Leases (Details) [Line Items]
Operating Leases, Rent Expense, Minimum Rentals	30,400
Area of Real Estate Property (in Square Feet)	27,850
Lessee Leasing Arrangements, Operating Leases, Term of Contract	28 months
Satel-FEI Office Lease [Member]
5. Property, Plant and Equipment and Leases (Details) [Line Items]
Operating Leases, Rent Expense, Minimum Rentals	$ 1,000
Lessee Leasing Arrangements, Operating Leases, Term of Contract	9 years
Minimum [Member] \| Satel-FEI Office Lease [Member]
5. Property, Plant and Equipment and Leases (Details) [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	3 years

5. Property, Plant and Equipment and Leases (Details) - Schedule of Property, Plant and Equipment (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Schedule of Property, Plant and Equipment [Abstract]
Buildings and building improvements	$ 5,224	$ 5,976
Machinery, equipment and furniture	52,987	49,651
	58,211	55,627
Less, accumulated depreciation	45,525	44,387
	$ 12,686	$ 11,240

5. Property, Plant and Equipment and Leases (Details) - Schedule of Future Minimum Rental Payments for Operating Leases (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015
Schedule of Future Minimum Rental Payments for Operating Leases [Abstract]
2016	$ 1,484
2017	1,174
2018	925
2019	600
Total future minimum lease payments	$ 4,183

6. Marketable Securities (Details) - Schedule of Available-for-sale Securities (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 10,397	$ 15,194
Gross Unrealized Gains	938	1,025
Gross Unrealized Losses	(149)	(189)
Fair Market Value	11,186	16,030
Fixed Income Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	3,379	8,927
Gross Unrealized Gains	104	116
Gross Unrealized Losses	(16)	(36)
Fair Market Value	3,467	9,007
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	7,018	6,267
Gross Unrealized Gains	834	909
Gross Unrealized Losses	(133)	(153)
Fair Market Value	$ 7,719	$ 7,023

6. Marketable Securities (Details) - Schedule of Unrealized Gain (Loss) on Investments (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
6. Marketable Securities (Details) - Schedule of Unrealized Gain (Loss) on Investments [Line Items]
Fair Value, Less than 12 months	$ 3,419	$ 867
Unrealized Losses, Less than 12 months	(134)	(4)
Fair Value, Morethan 12 months	461	1,373
Unrealized Losses, More than 12 months	(15)	(185)
Fair Value	3,880	2,240
Unrealized Losses	(149)	(189)
Fixed Income Securities [Member]
6. Marketable Securities (Details) - Schedule of Unrealized Gain (Loss) on Investments [Line Items]
Fair Value, Less than 12 months	96	501
Unrealized Losses, Less than 12 months	(1)	(3)
Fair Value, Morethan 12 months	461	448
Unrealized Losses, More than 12 months	(15)	(33)
Fair Value	557	949
Unrealized Losses	(16)	(36)
Equity Securities [Member]
6. Marketable Securities (Details) - Schedule of Unrealized Gain (Loss) on Investments [Line Items]
Fair Value, Less than 12 months	3,323	366
Unrealized Losses, Less than 12 months	(133)	(1)
Fair Value, Morethan 12 months	0	925
Unrealized Losses, More than 12 months	0	(152)
Fair Value	3,323	1,291
Unrealized Losses	$ (133)	$ (153)

6. Marketable Securities (Details) - Schedule of Fair Value, by Balance Sheet Grouping (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current	$ 11,186	$ 16,030
Fixed Income Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current	251
Due after one year through five years	1,308
Due after five years through ten years	1,820
	$ 3,379

7. Debt Obligations (Details)	12 Months Ended		0 Months Ended	12 Months Ended				0 Months Ended		12 Months Ended		12 Months Ended
7. Debt Obligations (Details)	Apr. 30, 2015 USD ($)	Apr. 30, 2014 USD ($)	Jun. 06, 2013 JP Morgan Chase Bank, N.A. [Member] Line of Credit [Member]	Apr. 30, 2015 JP Morgan Chase Bank, N.A. [Member] Line of Credit [Member] USD ($)	Apr. 30, 2014 JP Morgan Chase Bank, N.A. [Member] Line of Credit [Member]	Jun. 06, 2013 JP Morgan Chase Bank, N.A. [Member] Line of Credit [Member] USD ($)	Jun. 06, 2013 JP Morgan Chase Bank, N.A. [Member] Line of Credit [Member] Debt Instrument, Tranche Two [Member] USD ($)	Jun. 06, 2013 JP Morgan Chase Bank, N.A. [Member] Line of Credit [Member] Debt Instrument, Tranche Two [Member] London Interbank Offered Rate (LIBOR) [Member]	Jun. 06, 2013 JP Morgan Chase Bank, N.A. [Member] Line of Credit [Member] Debt Instrument, Tranche One [Member] London Interbank Offered Rate (LIBOR) [Member]	Apr. 30, 2014 European Bank [Member] Line of Credit [Member] USD ($)	Apr. 30, 2015 European Bank [Member] Line of Credit [Member] EUR (€)	Apr. 30, 2014 European Bank [Member] Line of Credit [Member] EURO Interbank Offered Rate [Member]	Apr. 30, 2015 European Bank [Member] USD ($)
7. Debt Obligations (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 25,000,000	$ 15,000,000				€ 250,000		$ 275,000
Proceeds from Lines of Credit (in Dollars)	2,300,000	4,100,000		2,300,000
Repayments of Lines of Credit (in Dollars)				6,400,000
Line of Credit Facility, Borrowing Capacity, Description			Pursuant to the Credit Agreement, the amount of Tranche A borrowings may not exceed the value of the Pledged Investments (as defined in the Credit Agreement). The amount of Tranche B borrowings may not exceed the lesser of (i) $15.0 million and (ii) the Borrowing Base (as defined in the Credit Agreement).
Line of Credit Facility, Collateral			The Facility is fully guaranteed by certain of the Company’s subsidiaries and is secured by, among other things, a pledge of substantially all personal property of the Company and certain of the Company’s subsidiaries.
Debt Instrument, Basis Spread on Variable Rate								1.75%	0.75%			1.00%
Line of Credit Facility, Interest Rate at Period End				0.9305%	1.235%					1.235%	1.12%
Line of Credit Facility, Expiration Date			Jun. 05, 2018
Line of Credit Facility, Commitment Fee Percentage			0.10%
Long-term Line of Credit (in Dollars)										$ 0			$ 0
Debt Instrument, Payment Terms										Borrowings under the bank credit line, if any, must be repaid within one year of receipt of funds

8. Accrued Liabilities (Details) - Schedule of Accrued Liabilities (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Schedule of Accrued Liabilities [Abstract]
Vacation and other compensation	$ 1,633	$ 1,761
Incentive compensation	1,302	1,389
Payroll taxes	1,012	1,613
Deferred revenue	720	1,023
Warranty reserve	617	617	598
Cost conversion	450	0
Commissions	407	287
Other	489	671
	$ 6,630	$ 7,361

9. Investment in Morion, Inc. (Details) (Morion Inc [Member], USD $)	12 Months Ended			0 Months Ended	1 Months Ended	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013	Oct. 22, 2012 Licensing Agreement [Member]	Nov. 30, 2012 Licensing Agreement [Member]	Apr. 30, 2014 Licensing Agreement [Member]	Oct. 22, 2012 Licensing Agreement [Member]
9. Investment in Morion, Inc. (Details) [Line Items]
Cost Method Investment Ownership Percentage	4.60%
Related Party Transaction, Purchases from Related Party	$ 201,000	$ 213,000
Revenue from Related Parties	615,000	1,044,000				500,000
Accounts Receivable, Related Parties, Current	145,000
Accounts Payable, Related Parties, Current	23,000
Long-term Purchase Commitment, Description				The agreement requires the Company to supply production equipment and parts and to provide training to Morion employees to enable Morion to achieve certain levels of volume production of rubidium oscillators.
License And Equipment Fee Receivable							2,700,000
Percentage Of Royalties Payable On Third Party Sales				5.00%
Long-term Purchase Commitment, Period				5 years
Purchase Commitment, Remaining Minimum Amount Committed							400,000
Proceeds from Deposits from Customers			925,000		925,000	925,000
Gain (Loss) on Disposition of Property Plant Equipment						$ 736,000

10. Goodwill and Other Intangible Assets (Details) (USD $)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2004 Frequency Electronics Inc Zyfer [Member]	Feb. 29, 2012 FEI-Elcom [Member]
10. Goodwill and Other Intangible Assets (Details) [Line Items]
Goodwill			$ 218,000	$ 398,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill				275,000
Amortization of Intangible Assets	$ 73,000	$ 91,000

11. Employee Benefit Plans (Details) (USD $)	12 Months Ended			3 Months Ended	12 Months Ended						12 Months Ended			12 Months Ended												12 Months Ended			12 Months Ended
11. Employee Benefit Plans (Details) (USD $)	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013	Jul. 27, 2015 Subsequent Event [Member]	Apr. 30, 2015 Employees [Member]	Apr. 30, 2015 Employee Stock Option [Member]	Apr. 30, 2014 Employee Stock Option [Member]	Apr. 30, 2015 Stock Appreciation Rights (SARs) [Member]	Apr. 30, 2015 Stock Appreciation Rights (SARs) [Member] Employees and Directors [Member]	Apr. 30, 2015 Stock Appreciation Rights (SARs) [Member] Employees and Directors [Member] Options at $8.01 [Member]	Apr. 30, 2015 United States Post-Retirement Benefit Plan of US Entity, Defined Benefit [Member]	Apr. 30, 2014 United States Post-Retirement Benefit Plan of US Entity, Defined Benefit [Member]	Apr. 30, 2015 Income Incentive Pool [Member]	Apr. 30, 2015 Nonqualified Stock Options [Member] Immediate Family Member of Management or Principal Owner [Member]	Apr. 30, 2014 Nonqualified Stock Options [Member] Immediate Family Member of Management or Principal Owner [Member]	Apr. 30, 2013 Nonqualified Stock Options [Member] Immediate Family Member of Management or Principal Owner [Member]	Apr. 30, 2015 Incentive Stock Options [Member] Employee Stock Option [Member]	Apr. 30, 2015 Incentive Stock Options [Member] Employee Stock Option [Member] Options at $13.15 [Member]	Apr. 30, 2015 ISO and NQSO [Member] Employee Stock Option [Member]	Apr. 30, 2015 Independent Contractor Stock Option Plan [Member]	Apr. 30, 2014 Independent Contractor Stock Option Plan [Member]	Apr. 30, 2006 Independent Contractor Stock Option Plan [Member]	Apr. 30, 2015 Restricted Stock Plan [Member]	Apr. 30, 2014 Restricted Stock Plan [Member]	Apr. 30, 1990 Restricted Stock Plan [Member]	Apr. 30, 1990 Employee Stock Ownership Plan [Member]	Apr. 30, 2015 Employee Stock Ownership Plan [Member]	Apr. 30, 2000 Employee Stock Ownership Plan [Member]	Apr. 30, 2015 Deferred Compensation Agreement [Member]	Apr. 30, 2014 Deferred Compensation Agreement [Member]
11. Employee Benefit Plans (Details) [Line Items]
Stock Issued During Period, Shares, Employee Benefit Plan											40,324	41,775
Stock Issued During Period, Value, Employee Benefit Plan (in Dollars)	$ 485,000	$ 466,000									$ 485,000	$ 466,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition (in Dollars)											302,000	277,000
Common Stock, Capital Shares Reserved for Future Issuance				853,601							467,975
Number of Plans				2
Accrued Bonuses (in Dollars)													1,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period						5 years		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	145,000	212,000							1,950,000							37,500	172,500	95,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)	$ 13.02	$ 10.30														$ 6.67		$ 13.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(205,500)	(196,000)			38,000				147,500					20,000	17,500		57,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercise Price (in Dollars per share)														$ 6.67										$ 4.00
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	58,000				6,931				70,675					8,638	7,276				15,569
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	71,572								76,825										42,431				7,500		375,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,603,125	1,722,625	1,708,625						1,603,000											30,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,131,375									1,131,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price (in Dollars per share)	$ 8.27									$ 8.27
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)	1,071,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	1 year 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares	244,625	268,875
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value (in Dollars)	1,053,000	993,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value (in Dollars per share)	$ 4.45	$ 4.57
Employee Benefits and Share-based Compensation (in Dollars)	1,516,000	1,246,000				394,000	426,000
Share-based Compensation (in Dollars)	1,077,000	1,105,000				683,000	679,000													0	0
Deferred Tax Expense from Stock Options Exercised (in Dollars)						200,000	182,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized																						350,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in Dollars per share)	$ 8.90	$ 8.60	$ 8.23																		$ 14.76
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP																										561,652
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized																										510,000
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares																												1,071,652
Employee Stock Ownership Plan (ESOP), Shares in ESOP																											385,626
Deferred Compensation Arrangement with Individual, Description																													Under these agreements, each key employee receives specified retirement payments for the remainder of the employee's life with a minimum payment of ten years' benefits to either the employee or his beneficiaries. The agreements also provide for lump sum payments upon termination of employment without cause and reduced benefits upon early retirement.
Deferred Compensation Arrangement with Individual, Compensation Expense (in Dollars)																													$ 1,038,000	$ 780,000

11. Employee Benefit Plans (Details) - Schedule of Share-based Compensation, Stock Options, Activity (USD $)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Schedule of Share-based Compensation, Stock Options, Activity [Abstract]
Options, Shares Outstanding	1,603,125	1,722,625	1,708,625
Options, Weighted-Average Exercise Price (in Dollars per share)	$ 8.90	$ 8.60	$ 8.23
Options, Weighted Average Remaining Contractual Term	5 years 292 days	6 years	6 years 36 days
Options, Aggregate Intrinsic Value (in Dollars)	$ 6,952,378
Exercisable	1,131,375
Exercisable (in Dollars per share)	$ 8.27
Exercisable	4 years 292 days
Exercisable (in Dollars)	$ 5,619,840
Available for future grants	71,572
Options, Shares Granted	145,000	212,000
Options, Weighted-Average Exercise Price Granted (in Dollars per share)	$ 13.02	$ 10.30
Options, Shares Exercised	(205,500)	(196,000)
Options, Weighted-Average Exercise Price Exercised (in Dollars per share)	$ 7.72	$ 7.16
Options, Shares Expired or Canceled	(59,000)	(2,000)
Options, Weighted-Average Exercise Price Expired or Canceled (in Dollars per share)	$ 14.32	$ 10.06

12. Income Taxes (Details) (USD $)	12 Months Ended
12. Income Taxes (Details) (USD $)	Apr. 30, 2015	Apr. 30, 2014
Valuation Allowance of Deferred Tax Assets [Member]
12. Income Taxes (Details) [Line Items]
Valuation Allowances and Reserves, Period Increase (Decrease)	$ 270,000	$ 220,000
Domestic Tax Authority [Member]
12. Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	5,100,000
Operating Loss Carryforwards, Limitations on Use	1 million which may be applied in annually limited amounts to offset future U.S.-sourced taxable income over the next 17 years
Domestic Tax Authority [Member] \| Valuation Allowance of Deferred Tax Assets [Member]
12. Income Taxes (Details) [Line Items]
Valuation Allowances and Reserves, Period Increase (Decrease)	760,000	103,000
Foreign Tax Authority [Member] \| Valuation Allowance of Deferred Tax Assets [Member]
12. Income Taxes (Details) [Line Items]
Valuation Allowances and Reserves, Period Increase (Decrease)	(490,000)	(117,000)
Foreign Exchange [Member]
12. Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	$ 4,200,000

12. Income Taxes (Details) - Schedule of Components of Income Tax Expense (Benefit) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Current:
Federal	$ 2,170	$ 2,190
Foreign	0	0
State	260	230
Current provision	2,430	2,420
Deferred:
Federal	(560)	(280)
Foreign	(630)	(103)
State	(290)	120
Deferred benefit	(1,480)	(263)
Change in valuation allowance	760	103
Total provision	$ 1,710	$ 2,260

12. Income Taxes (Details) - Schedule of Effective Income Tax Rate Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Schedule of Effective Income Tax Rate Reconciliation [Abstract]
Computed "expected" tax expense	$ 1,542	$ 2,142
State and local tax, net of federal benefit	(126)	214
Valuation allowance on deferred tax assets	760	103
Foreign losses without tax benefit	73	222
Nondeductible expenses	112	199
Nontaxable life insurance cash value increase	(119)	(151)
Tax credits	(191)	(203)
Other items, net, none of which individually exceeds 5% of federal taxes at statutory rates	(341)	(266)
	$ 1,710	$ 2,260

12. Income Taxes (Details) - Schedule of Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Deferred tax assets:
Employee benefits	$ 7,400	$ 6,860
Inventory	1,580	1,750
Accounts receivable	570	570
Tax credits	860	770
Other liabilities	200	240
Net operating loss carryforwards	3,230	3,130
Total deferred tax asset	13,840	13,320
Deferred tax liabilities:
Marketable securities	270	280
Property, plant and equipment	820	1,050
Net deferred tax asset	12,750	11,990
Valuation allowance	(2,390)	(2,120)
Net deferred tax assets	10,360	9,870
Gross current assets	3,350	3,600
Valuation allowance	0	0
Current liabilities	(350)	(380)
Net current deferred tax assets	3,000	3,220
Gross noncurrent assets	10,700	9,940
Valuation allowance	(2,390)	(2,120)
Noncurrent liabilities	(950)	(1,170)
Net noncurrent deferred tax assets	$ 7,360	$ 6,650

13. Segment Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
13. Segment Information (Details) [Line Items]
Number of Reportable Segments	3
Number of Operating Segments	3
Frequency Electronics Inc New York [Member]
13. Segment Information (Details) [Line Items]
Number Of Principal Markets	3
Gillam Frequency Electronics Inc [Member] \| Intersegment Sales [Member]
13. Segment Information (Details) [Line Items]
Sales Revenue, Goods, Gross (in Dollars)	$ 1.5	$ 1.6
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Gillam Frequency Electronics Inc [Member]
13. Segment Information (Details) [Line Items]
Segment Reporting, Disclosure of Major Customers		sales to one customer exceeded 10% of that segment’s revenues
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Frequency Electronics Inc Zyfer [Member]
13. Segment Information (Details) [Line Items]
Segment Reporting, Disclosure of Major Customers	two customers accounted for more than 10% of that segment’s sales	one customer accounted for more than 10% of that segment’s sales
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Gillam-FEI and FEI-Zyfer [Member]
13. Segment Information (Details) [Line Items]
Segment Reporting, Disclosure of Major Customers		None of the customers in the Gillam-FEI and FEI-Zyfer segments accounted for more than 10% of consolidated revenues.
U.S. Government and U.S. Government Subcontractors [Member] \| Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
13. Segment Information (Details) [Line Items]
Concentration Risk, Percentage	47.00%	54.00%
Two Customers [Member] \| Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Frequency Electronics Inc New York [Member]
13. Segment Information (Details) [Line Items]
Concentration Risk, Percentage	53.00%
Revenue, Net (in Dollars)	33.1
Segment Reporting, Disclosure of Major Customers		Each of these customers also exceeded 10% of the Company’s consolidated revenues
Three Customers [Member] \| Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Frequency Electronics Inc New York [Member]
13. Segment Information (Details) [Line Items]
Concentration Risk, Percentage		53.00%
Revenue, Net (in Dollars)		$ 29.4
Segment Reporting, Disclosure of Major Customers		Each of these customers also exceeded 10% of the Company’s consolidated revenues.

15. Other Comprehensive Income (Loss) (Details) - Schedule of Accumulated Other Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Apr. 30, 2015

Apr. 30, 2014

Schedule of Accumulated Other Comprehensive Income (Loss) [Abstract]

Balance, Change in Market Value of Marketable Securities

$ 1,016

$ 1,420

Balance, Foreign Currency Translation Adjustment

2,998

2,493

Balance, Total

4,014

3,913

Items of other comprehensive income (loss) before reclassification, pretax, Change in Market Value of Marketable Securities

519

(292)

Items of other comprehensive income (loss) before reclassification, pretax, Foreign Currency Translation Adjustment

(1,093)

505

Items of other comprehensive income (loss) before reclassification, pretax, Total

(574)

213

Tax effect - Change in Market Value of Marketable Securities

(176)

130

Tax effect - Foreign Currency Transalation Adjustment

Tax effect - Total

(176)

130

Items of other comprehensive income (loss)before reclassification, net of taxes, Market Value of Marketable Securities

343

(162)

Items of other comprehensive income (loss)before reclassification, net of taxes, Foreign Currency Translation Adjustment

(1,093)

505

Items of other comprehensive income (loss)before reclassification, net of taxes, Total

(750)

343

Reclassification adjustments, pretax - Marketable Securities

(566)

^[1]

(367)

^[1]

Tax - Marketable Securities

192

125

Tax effect - Change in Market Value of Marketable Securities

(374)

(242)

Tax effect - Total

(374)

(242)

Total other comprehensive income (loss), net of taxes, Marketable Securities

(31)

(404)

Total other comprehensive income (loss), net of taxes, Foreign Currency Transalation Adjustment

(1,093)

505

Total other comprehensive income (loss), net of taxes, Total

(1,124)

101

Balance, Change in Market Value of Marketable Securities

985

1,016

Balance, Foreign Currency Translation Adjustment

1,905

2,998

Balance, Total

$ 2,890

$ 4,014

[1]	The reclassification adjustments represent net realized gains on the sale or redemption of available-for-sale marketable securities that were reclassified from AOCI to Other income (expense), net.

Consolidated Statements of Income and Comprehensive Income (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Change in market value of marketable securities before reclassification, tax	$ (176)	$ 130
Reclassification adjustment for realized gains included in net income, tax	$ 192	$ 125

10. Goodwill and Other Intangible Assets	12 Months Ended
10. Goodwill and Other Intangible Assets	Apr. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	10. Goodwill and Other Intangible Assets During fiscal year 2004, the Company acquired FEI-Zyfer, Inc. (“FEI-Zyfer”). This acquisition resulted in the recording of $218,000 in goodwill. In February 2012, the Company acquired FEI-Elcom resulting in the recording of goodwill in the amount of $398,000 plus other intangible assets with a value of $275,000. Management has determined that goodwill is not impaired as of April 30, 2015 and 2014. The other intangible assets were amortized over a three-year period from the date of acquisition. Amortization expense for the years ended April 30, 2015 and 2014 was approximately $73,000 and $91,000, respectively.

1. Summary of Accounting Policies (Details)	12 Months Ended
1. Summary of Accounting Policies (Details)	Apr. 30, 2015
Building [Member]
1. Summary of Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Certification Marks [Member]
1. Summary of Accounting Policies (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum [Member] \| Other Depreciable Assets [Member]
1. Summary of Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] \| Other Depreciable Assets [Member]
1. Summary of Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	10 years

2. Earnings Per Share (Details) (Equity Option [Member])	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Equity Option [Member]
2. Earnings Per Share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	271,500	270,875

3. Costs and Estimated Earnings in Excess of Billings (Details) (USD $)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
3. Costs and Estimated Earnings in Excess of Billings (Details) [Line Items]
Revenues	$ 76,564,000	$ 71,550,000
Contracts Accounted for under Percentage of Completion [Member]
3. Costs and Estimated Earnings in Excess of Billings (Details) [Line Items]
Revenues	46,800,000	43,200,000
Anticipated Loss on Contracts	$ 400,000

Non-cash operating and investing activities: (Details) (Morion Inc [Member], USD $)	12 Months Ended
	Apr. 30, 2013
Morion Inc [Member]
Non-cash operating and investing activities: (Details) [Line Items]
Proceeds from Deposits from Customers	$ 925,000

2. Earnings Per Share (Details) - Schedule of Earnings Per Share, Basic and Diluted	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Schedule of Earnings Per Share, Basic and Diluted [Abstract]
Basic EPS Shares outstanding (weighted average)	8,610,950	8,526,576
Effect of Dilutive Securities	298,808	290,381
Diluted EPS Shares outstanding	8,909,758	8,816,957

4. Inventories (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
4. Inventories (Details) [Line Items]
Inventory, Net	$ 38,239	$ 41,227
UNITED STATES
4. Inventories (Details) [Line Items]
Inventory, Net	32,000	33,400
BELGIUM
4. Inventories (Details) [Line Items]
Inventory, Net	5,400	7,100
CHINA
4. Inventories (Details) [Line Items]
Inventory, Net	$ 800	$ 700

6. Marketable Securities (Details) - Schedule of Realized Gain (Loss) on Investments (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Schedule of Realized Gain (Loss) on Investments [Abstract]
Proceeds	$ 7,271	$ 4,993
Gross realized gains	571	367
Gross realized losses	$ (5)	$ 0

12. Income Taxes (Details) - Schedule of Income before Income Tax, Domestic and Foreign (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Schedule of Income before Income Tax, Domestic and Foreign [Abstract]
U.S.	$ 6,201	$ 7,565
Foreign	(1,665)	(1,265)
	$ 4,536	$ 6,300

13. Segment Information (Details) - Schedule of Reconciliation of Assets from Segment to Consolidated (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Identifiable assets:
Identifiable Assets	$ 117,825	$ 119,461
Frequency Electronics Inc New York [Member]
Identifiable assets:
Identifiable Assets	63,541	62,969
Gillam Frequency Electronics Inc [Member]
Identifiable assets:
Identifiable Assets	9,878	19,595
Frequency Electronics Inc Zyfer [Member]
Identifiable assets:
Identifiable Assets	11,088	11,220
Inter Segment [Member]
Identifiable assets:
Identifiable Assets	(8,775)	(19,819)
Corporate Segment [Member]
Identifiable assets:
Identifiable Assets	$ 42,093	$ 45,496

13. Segment Information (Details) - Schedule of Reconciliation of Assets from Segment to Consolidated (Parentheticals) (Frequency Electronics Inc New York [Member], CNY) In Millions, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Frequency Electronics Inc New York [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable assets in China	3	3

13. Segment Information (Details) - Schedule of Reconciliation of Depreciation and Amortization from Segment to Consolidated (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Depreciation and amortization (allocated):
Depreciation and Amortization	$ 2,944	$ 2,471
Frequency Electronics Inc New York [Member]
Depreciation and amortization (allocated):
Depreciation and Amortization	2,562	2,021
Gillam Frequency Electronics Inc [Member]
Depreciation and amortization (allocated):
Depreciation and Amortization	208	261
Frequency Electronics Inc Zyfer [Member]
Depreciation and amortization (allocated):
Depreciation and Amortization	159	174
Corporate Segment [Member]
Depreciation and amortization (allocated):
Depreciation and Amortization	$ 15	$ 15

13. Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
13. Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]
Revenues	$ 76,564	$ 71,550
FRANCE
13. Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]
Revenues	10,937	8,932
BELGIUM
13. Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]
Revenues	3,971	5,719
CHINA
13. Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]
Revenues	4,493	492
GERMANY
13. Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]
Revenues	1,076	60
Russia [Member]
13. Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]
Revenues	638	1,046
Other Countries [Member]
13. Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]
Revenues	2,446	2,428
Foreign Revenue [Member]
13. Segment Information (Details) - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Line Items]
Revenues	$ 23,561	$ 18,677

14. Product Warranties (Details)	12 Months Ended
14. Product Warranties (Details)	Apr. 30, 2015
Product Warranties Disclosures [Abstract]
Standard Product Warranty Description	The Company generally provides its customers with a one-year warranty regarding the manufactured quality and functionality of its products. For some limited products, the warranty period has been extended.

14. Product Warranties (Details) - Schedule of Product Warranty Liability (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Schedule of Product Warranty Liability [Abstract]
Balance at beginning of year	$ 617	$ 598
Warranty costs incurred	(296)	(339)
Product warranty accrual	296	358
Balance at end of year	$ 617	$ 617