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Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Oct. 31, 2017	Dec. 11, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	FREQUENCY ELECTRONICS INC
Document Type	10-Q
Current Fiscal Year End Date	--04-30
Entity Common Stock, Shares Outstanding		8,729,682
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	Oct. 31, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2017	Apr. 30, 2017
Current assets:
Cash and cash equivalents	$ 11,015	$ 2,163
Marketable securities	1,395	7,815
Accounts receivable, net of allowance for doubtful accounts of $187 at October 31, 2017 and at April 30, 2017	7,071	10,986
Costs and estimated earnings in excess of billings, net	5,949	7,964
Inventories, net	31,210	29,051
Prepaid income taxes	3,478	2,606
Prepaid expenses and other	1,242	1,105
Current assets of discontinued operations	8,157	8,165
Total current assets	69,517	69,855
Property, plant and equipment, at cost, net of accumulated depreciation and amortization	14,349	14,813
Deferred income taxes	11,794	11,902
Goodwill and other intangible assets	617	617
Cash surrender value of life insurance and cash held in trust	13,694	13,376
Other assets	2,169	2,187
Non-current assets of discontinued operations	562	569
Total assets	112,702	113,319
Current liabilities:
Accounts payable - trade	2,694	2,437
Accrued liabilities	2,907	3,425
Current liabilities of discontinued operations	1,978	2,249
Total current liabilities	7,579	8,111
Deferred compensation	13,453	13,252
Deferred rent and other liabilities	1,405	1,409
Non-current liabilities of discontinued operations	1,387	1,215
Total liabilities	23,824	23,987
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 8,843 outstanding at October 31, 2017; 8,817 outstanding at April 30, 2017	9,164	9,164
Additional paid-in capital	56,139	55,767
Retained earnings	22,845	23,712
	88,148	88,643
Common stock reacquired and held in treasury - at cost (321 shares at October 31, 2017 and 347 shares at April 30, 2017)	(1,472)	(1,592)
Accumulated other comprehensive income	2,202	2,281
Total stockholders’ equity	88,878	89,332
Total liabilities and stockholders’ equity	$ 112,702	$ 113,319

Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Thousands, $ in Thousands	Oct. 31, 2017	Apr. 30, 2017
Allowance for doubtful accounts (in Dollars)	$ 187	$ 187
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 issued	9,164	9,164
Common stock - authorized shares	20,000	20,000
Common stock - shares outstanding	8,843	8,817
Treasury stock, shares	321	347

Condensed Consolidated Statements of Income and Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Revenues	$ 9,337	$ 11,466	$ 21,360	$ 23,028
Cost of revenues	7,134	7,737	14,636	15,474
Gross margin	2,203	3,729	6,724	7,554
Selling and administrative expenses	2,335	2,816	5,046	5,648
Research and development expense	1,734	2,095	3,364	3,496
Operating loss	(1,866)	(1,182)	(1,686)	(1,590)
Other income (expense):
Investment income	13	187	1,167	279
Interest expense	(21)	(26)	(41)	(67)
Other income, net	1	0	3	1
Loss before provision for income taxes	(1,873)	(1,021)	(557)	(1,377)
Benefit for income taxes	(584)	(164)	(98)	(204)
Net loss from continuing operations	(1,289)	(857)	(459)	(1,173)
Loss from discontinued operations, net of tax	(192)	(167)	(408)	(557)
Net loss	$ (1,481)	$ (1,024)	$ (867)	$ (1,730)
Net loss per common share:
Basic loss from continued operations (in Dollars per share)	$ (0.15)	$ (0.10)	$ (0.05)	$ (0.14)
Basic loss from discontinued operations (in Dollars per share)	(0.02)	(0.02)	(0.05)	(0.06)
Basic loss per share (in Dollars per share)	(0.17)	(0.12)	(0.10)	(0.20)
Diluted loss from continued operations (in Dollars per share)	(0.15)	(0.10)	(0.05)	(0.14)
Diluted loss from discontinued operations (in Dollars per share)	(0.02)	(0.02)	(0.05)	(0.06)
Diluted loss per share (in Dollars per share)	$ (0.17)	$ (0.12)	$ (0.10)	$ (0.20)
Weighted average shares outstanding:
Basic (in Shares)	8,834,945	8,780,633	8,830,486	8,771,494
Diluted (in Shares)	8,834,945	8,780,633	8,830,486	8,771,494
Condensed Consolidated Statements of Comprehensive Loss
Net loss	$ (1,481)	$ (1,024)	$ (867)	$ (1,730)
Foreign currency translation adjustment	260	984	575	369
Change in market value of marketable securities before reclassification, net of tax of ($20) and ($61)	3	(194)	37	118
Reclassification adjustment for realized gains included in net income, net of tax of $356 in 2017	(2)	0	(691)	0
Total unrealized (loss) gain on marketable securities, net of tax	1	(194)	(654)	118
Total other comprehensive loss (income)	261	790	(79)	487
Comprehensive loss	$ (1,220)	$ (234)	$ (946)	$ (1,243)

Condensed Consolidated Statements of Income and Comprehensive Income (Loss) (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Change in market value of marketable securities before reclassification, tax	$ (2)	$ (161)	$ (20)	$ (61)
Reclassification adjustment for realized gains included in net income, tax	$ 1		$ 356

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Cash flows from operating activities:
Net loss from continuing operations	$ (1,289)	$ (857)	$ (459)	$ (1,173)
Net loss from discontinued operations	(192)	(167)	(408)	(557)
Net loss	(1,481)	(1,024)	(867)	(1,730)
Non-cash charges to earnings			1,451	2,864
Net changes in operating assets and liabilities			1,631	(4,340)
Cash provided by (used in) operating activities – continuing operations			2,215	(3,206)
Cash provided by operating activities – discontinued operations			614	728
Net cash provided by (used in) operating activities			2,829	(2,478)
Cash flows from investing activities:
Proceeds on redemption of marketable securities			6,477	1,000
Purchase of fixed assets and other assets			(883)	(2,413)
Cash provided by (used in) investing activities – continuing operations			5,594	(1,413)
Cash used in investing activities – discontinued operations			(28)	(10)
Net cash provided by (used in) investing activities			5,566	(1,423)
Cash flows from financing activities:
Tax benefit from exercise of stock-based compensation			1	25
Cash provided by financing activities – continuing operations			1	25
Cash used in financing activities – discontinued operations			0	280
Net cash provided by financing activities			1	305
Net increase (decrease) in cash and cash equivalents before effect of exchange rate changes			8,396	(3,596)
Effect of exchange rate changes on cash and cash equivalents			675	1,619
Net increase (decrease) in cash and cash equivalents			9,071	(1,977)
Cash and cash equivalents at beginning of period			2,738	6,082
Cash and cash equivalents at end of period	11,809	4,105	11,809	4,105
Less cash and equivalents of discontinued operations at end of period	794	344	794	344
Cash and cash equivalents of continuing operations at end of period	$ 11,015	$ 3,761	11,015	3,761
Supplemental disclosures of cash flow information:
Interest			41	76
Income Taxes			$ 325	$ 335

NOTE A - CONDENSED CONSOLIDATED FINANCIAL STATEMENTS	6 Months Ended
NOTE A - CONDENSED CONSOLIDATED FINANCIAL STATEMENTS	Oct. 31, 2017
Disclosure Text Block [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE A – CONDENSED CONSOLIDATED FINANCIAL STATEMENTS In the opinion of management of Frequency Electronics, Inc. (“the Company”), the accompanying unaudited condensed consolidated interim financial statements reflect all adjustments (which include only normal recurring adjustments) necessary to present fairly, in all material respects, the consolidated financial position of the Company as of October 31, 2017 and the results of its operations and cash flows for the six and three months ended October 31, 2017 and 2016. The April 30, 2017 condensed consolidated balance sheet was derived from audited financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted. It is suggested that these condensed consolidated financial statements be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended April 30, 2017, filed on July 31, 2017, and the financial statements and notes thereto. The results of operations for such interim periods are not necessarily indicative of the operating results for the full fiscal year.

NOTE B - DISCONTINUED OPERATIONS

6 Months Ended

Oct. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]

NOTE B – DISCONTINUED OPERATIONS

In December 2016, the Company entered into a share purchase agreement with certain foreign counterparties with respect to a potential sale of Gillam-FEI (“Gillam”), the Company’s Belgian subsidiary. However, these counterparties have not yet performed their obligations under that agreement. Because the counterparties have failed to perform their obligations under the share purchase agreement the Company has a right to terminate that share purchase agreement. The Company continues to negotiate with these counterparties to effectuate a closing of the transaction contemplated by the share purchase agreement, but the Company is also discussing a sale of the Gillam business with other potential buyers. In April 2017, the Company decided to sell its Gillam business as soon as practicable, and began contacting potential buyers other than the counterparty to the stock purchase agreement. The Company believes that the divestment should be completed by the end of fiscal year 2018. Accordingly, the Company determined that the assets and liabilities of this reportable segment met the discontinued operations criteria in Accounting Standards Codification 205-20-45 for the year ended April 30, 2017, and Gillam’s results have been classified as discontinued operations in the accompanying Consolidated Statements of Operations and Comprehensive Loss.

Summarized operating results for the Gillam discontinued operations, for the three and six months ended October 31, 2017 and 2016 respectively, are as follows:

	Six months						Three months
	Periods ended October 31,
	2017			2016			2017			2016
	(UNAUDITED)			(UNAUDITED)			(UNAUDITED)			(UNAUDITED)
	(In thousands except par value)
Revenues	$	1,955		$	2,294		$	943		$	1,448
Cost of Revenues		1,390			1,621			674			1,064
Gross Margin		565			673			269			384
Selling and administrative expenses		703			950			346			456
Research and development expenses		268			277			118			94
Operating Loss		(406	)		(554	)		(195	)		(166	)
Other income (expense):
Investment (loss) income
Other income (expense), net		(3	)		(3	)		(2	)		(2	)
Loss before provision for income taxes		(409	)		(557	)		(197	)		(168	)
Benefit for income taxes		1			-			5			-
Net Loss	$	(408	)	$	(557	)	$	(192	)	$	(168	)

The carrying amounts of assets and liabilities for the Gillam discontinued operations are as follows:

	October 31,		April 30,
	2017		2017

Cash and cash equivalents	$	794	$	575
Accounts receivable, net of allowance for doubtful accounts		2,525		3,202
Inventories, net		4,633		3,980
Prepaid expenses and other		205		408
Total current assets of discontinued operations	$	8,157	$	8,165
Property, plant and equipment, at cost, net of accumulated depreciation and amortization	$	547	$	555
Investments		15		14
Deferred taxes – non-current		-		-
Total non-current assets of discontinued operations	$	562	$	569

Accounts payable – trade	$	1,004	$	949
Accrued liabilities		974		1,300
Total current liabilities of discontinued operations		1,978		2,249
Deferred rent and other liabilities		1,387		1,215
Total non-current liabilities of discontinued operations	$	1,387	$	1,215

NOTE C - EARNINGS PER SHARE

6 Months Ended

Oct. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

NOTE C – EARNINGS PER SHARE

Reconciliation of the weighted average shares outstanding for basic and diluted Earnings Per Share are as follows:

	Six months				Three months
	Periods ended October 31,
	2017		2016		2017		2016
Weighted average shares outstanding:
Basic		8,830,486		8,771,494		8,834,945		8,780,633
Effect of dilutive securities		**		**		**		**
Diluted		8,830,486		8,771,494		8,834,945		8,780,633

** For the six and three month periods ended October 31, 2017, dilutive securities are excluded since the inclusion of such shares would be antidilutive due to the net loss for the periods. The exercisable shares excluded are 1,353,750. The effect of dilutive securities for the periods would have been 129,245 and 117,209, respectively. For the six and three month periods ended October 31, 2016, dilutive securities are excluded since the inclusion of such shares would be antidilutive due to the net loss for the periods. The exercisable shares excluded are 1,265,375. The effect of dilutive securities for the periods would have been 184,793 and 190,418, respectively.

The computation of diluted earnings per share in the other fiscal periods excludes those options and stock appreciation rights (“SARS”) with an exercise price in excess of the average market price of the Company’s common shares during the periods presented. The inclusion of such options and SARS in the computation of earnings per share would have been antidilutive. The number of excluded options and SARS were:

Six months

Three months

Periods ended October 31,

2017

2016

2017

2016

Outstanding options and SARS excluded

- **

NOTE D - COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET

6 Months Ended

Oct. 31, 2017

Contractors [Abstract]

Long-term Contracts or Programs Disclosure [Text Block]

NOTE D – COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET

At October 31, 2017 and April 30, 2017, costs and estimated earnings in excess of billings, net, consist of the following:

	October 31, 2017			April 30, 2017
	(In thousands)
Costs and estimated earnings in excess of billings	$	6,205		$	8,890
Billings in excess of costs and estimated earnings		(256	)		(926	)
Net asset	$	5,949		$	7,964

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, whereas the related revenue is recognized on the percentage of completion basis at the measurement date. 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 six and three months ended October 31, 2017, revenue recognized under percentage of completion contracts was approximately $10.9 million and $4.5 million, respectively. During the six and three months ended October 31, 2016, such revenue was approximately $12.4 million and $5.1 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.

NOTE E - TREASURY STOCK TRANSACTIONS	6 Months Ended
NOTE E - TREASURY STOCK TRANSACTIONS	Oct. 31, 2017
Disclosure Text Block Supplement [Abstract]
Treasury Stock [Text Block]	NOTE E – TREASURY STOCK TRANSACTIONS During the six and three months period ended October 31, 2017, the Company made contributions of 25,270 shares and 11,530 shares, respectively, of its common stock held in treasury to the Company’s profit sharing plan and trust under Section 401(k) of the Internal Revenue Code. Such contributions are in accordance with the Company’s discretionary match of employee voluntary contributions to this plan. During the six months ended October 31, 2017, the Company issued 844 shares from treasury upon the exercise of SARS by certain officers and employees of the Company.

NOTE F - INVENTORIES

6 Months Ended

Oct. 31, 2017

Inventory Disclosure [Abstract]

Inventory Disclosure [Text Block]

NOTE F – INVENTORIES

Inventories, which are reported at the lower of cost or market, consist of the following:

	October 31, 2017		April 30, 2017
	(In thousands)
Raw Materials and Component Parts	$	18,552	$	17,702
Work in Progress		8,233		7,340
Finished Goods		4,425		4,009
	$	31,210	$	29,051

As of October 31, 2017 and April 30, 2017, approximately $30.2 million and $28.2 million, respectively, of total inventory is located in the United States and $1 million and $0.8 million, respectively, is located in China. The Company buys inventory in bulk quantities which may be used over significant time periods; due to its nature the inventory does not deteriorate.

NOTE G - SEGMENT INFORMATION

6 Months Ended

Oct. 31, 2017

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

NOTE G – SEGMENT INFORMATION

The Company operates under two 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)

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 tables below present information about reported segments with reconciliation of segment amounts to consolidated amounts as reported in the statement of income or the balance sheet for each of the periods (in thousands):

	Six months						Three months
	Periods ended October 31,
	2017			2016			2017			2016
Revenues:
FEI-NY	$	15,740		$	17,715		$	6,579		$	7,733
FEI-Zyfer		7,865			6,596			3,593			4,249
less intersegment revenues		(2,245	)		(1,283	)		(835	)		(516	)
Consolidated revenues	$	21,360		$	23,028		$	9,337		$	11,466

Operating loss:
FEI-NY	$	(2,758	)	$	(1,887	)	$	(2,358	)	$	(1,714	)
FEI-Zyfer		1,275			463			584			648
Corporate		(203	)		(166	)		(92	)		(116	)
Consolidated operating loss	$	(1,686	)	$	(1,590	)	$	(1,866	)	$	(1,182	)

	October 31, 2017			April 30, 2017
Identifiable assets:
FEI-NY (approximately $1.6 million in China)	$	62,242		$	64,828
FEI-Zyfer		10,663			10,427
less intersegment balances		(12,797	)		(11,992	)
Corporate		52,594			50,056
Consolidated identifiable assets	$	112,702		$	113,319

NOTE H - INVESTMENT IN MORION, INC.	6 Months Ended
NOTE H - INVESTMENT IN MORION, INC.	Oct. 31, 2017
Investment Holdings [Abstract]
Investment Holdings [Text Block]	NOTE H – INVESTMENT IN MORION, INC. The Company has an investment in Morion, Inc., (“Morion”) 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 six months ended October 31, 2017 and 2016, the Company acquired product from Morion in the aggregate amount of approximately $170,000 and $204,000, respectively, and the Company sold product and training services to Morion in the aggregate amount of approximately $182,000 and $10,000, respectively. (See discussion of revenues recognized under the license agreement in the paragraph below.) During the three months ended October 31, 2017 and 2016, the Company acquired product from Morion in the aggregate amount of approximately $106,000 and $123,000, respectively, and the Company did not have sales of product nor training services to Morion in same periods. At October 31, 2017 there were neither amounts owed nor receivable related to Morion. During the six months ended October 31, 2017 and 2016, the Company received a dividend from Morion in the amount of approximately $51,000 and $100,000, respectively. On October 22, 2012, the Company entered into an agreement to license its rubidium oscillator production technology to Morion. The agreement required the Company to sell certain fully-depreciated production equipment previously owned by the Company and to provide training to Morion employees to enable Morion to produce a minimum of 5,000 rubidium oscillators per year. Morion will pay the Company approximately $2.7 million for the license and the equipment plus 5% royalties on third party sales for a 5-year period following an initial production run. During the same 5-year period, 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. During the fiscal year ended April 30, 2016, sales to Morion included $375,000 for product and training services under this agreement. Per the amended agreement, the balance of $1 million for the transfer of the license will be due once the United States Department of State (“the State Department”) approves the removal of certain provisions of the original agreement. The State Department has approved the technology transfer called for under the agreement. On March 29, 2016, the Company renegotiated the $1 million amendment under the original agreement dated October 22, 2012 to $602,000 due to the U.S. Government easing of export regulations. Of this amount $392,500 was billed and paid during fiscal year 2016 and the balance of $210,000 was billed during fiscal year 2017 and was subsequently collected. During the six months ended October 31, 2017 and 2016, sales to Morion include $182,000 and $10,000, respectively, under this agreement.

NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS

6 Months Ended

Oct. 31, 2017

Investments, Debt and Equity Securities [Abstract]

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

NOTE I – FAIR VALUE OF FINANCIAL INSTRUMENTS

The cost, gross unrealized gains, gross unrealized losses, and fair market value of available-for-sale securities at October 31, 2017 and April 30, 2017, respectively are as follows (in thousands):

	October 31, 2017
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Market Value
Fixed income securities	$	1,316	$	79	$	-	$	1,395
Equity securities		-		-		-		-
	$	1,316	$	79	$	-	$	1,395

	April 30, 2017
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Fixed income securities	$	1,516	$	60	$	-		$	1,576
Equity securities		5,230		1,248		(239	)		6,239
	$	6,746	$	1,308	$	(239	)	$	7,815

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 (in thousands):

	Less than 12 months					12 Months or more					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
October 31, 2017
Fixed Income Securities	$	-	$	-		$	-	$	-		$	-	$	-
Equity Securities		-		-			-		-			-		-
	$	-	$	-		$	-	$	-		$	-	$	-
April 30, 2017
Fixed Income Securities	$	-	$	-		$	-	$	-		$	-	$	-
Equity Securities		219		(9	)		1,024		(230	)		1,243		(239	)
	$	219	$	(9	)	$	1,024	$	(230	)	$	1,243	$	(239	)

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 October 31, 2017 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.

During the six months ended October 31, 2017 the Company sold or redeemed available-for-sale securities in the amounts of $6.5 million, realizing gains of approximately $1 million. During the six months ended October 31, 2016, the Company sold or redeemed available-for-sale securities in the amount $1.0M, realizing no gain or loss.

Maturities of fixed income securities classified as available-for-sale at October 31, 2017 are as follows, at cost (in thousands):

Current	$	-
Due after one year through five years		98
Due after five years through ten years		1,217
	$	1,315

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; and

- 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 valued on a Level 1 basis.

NOTE J - RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS	6 Months Ended
NOTE J - RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS	Oct. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	NOTE J – RECENT ACCOUNTING PRONOUNCEMENTS In January 2017, the Financial Accounting Standards Board (“the FASB”) issued Accounting Standards Update (“ASU”) 2017-04, Intangibles – Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment (“ASU 2017-04”), which simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Under ASU 2017-04 goodwill impairment will be tested by comparing the fair value of a reporting unit with its carrying amount, and recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. The new guidance must be applied on a prospective basis and is effective for periods beginning after December 15, 2019, with early adoption permitted. The Company will not be adopting ASU 2017-04 early, and is in the process of determining the effect that ASU 2017-04 may have, however, the Company expects the new standard to have an immaterial effect on its financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”) which clarifies how certain cash receipts and payments should be presented in the statement of cash flows. The guidance is effective for fiscal years beginning after December 15, 2017 and early adoption is permitted. The update is not expected to have a material impact on the financial statements when it becomes effective in the first quarter of fiscal year 2019. In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”) which replaces the incurred loss impairment methodology in current generally accepted accounting priciples (“GAAP”) with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The new guidance is effective for fiscal years beginning after December 15, 2019. The Company is evaluating the effect, if any, the update will have on the financial statements when adopted in fiscal year 2021. In February 2016, the FASB issued ASU No. 2016-02 Leases (Topic 842) (“ASU 2016-02”). The objective of the update is to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The standard requires a modified retrospective transition approach for existing leases. The amendments of ASU 2016-02 are effective for fiscal years beginning after December 31, 2018 and early adoption is permitted. While the Company is currently evaluating the impact of this standard on its consolidated financial statements, the Company has minimal leases and expects that when adopted, beginning in fiscal year 2019, the new standard will have an immaterial effect on the Company’s financials. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). (“ASU 2014-09”) 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 ASU 2014-09. ASU 2014-09 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 currently evaluating the impact that ASU 2014-09 may have on its financial statements when the statement is adopted for its fiscal year 2019. It appears that there will be an effect on the way the Company recognizes revenue and the associated disclosures, however based upon the work that the Company has done it expects the effect to be immaterial.

NOTE K - CREDIT FACILITY	6 Months Ended
NOTE K - CREDIT FACILITY	Oct. 31, 2017
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	NOTE K – CREDIT FACILITY On January 30, 2017, the Company repaid the principal balance due on its credit facility, dated June 6, 2013, with JPMorgan Chase Bank, N.A. Subsequently, the Company voluntarily terminated this credit facility with JPMorgan Chase Bank, N.A to reduce the fees and expenses associated with maintaining that facility. The Company did not incur any early termination fees associated with its voluntary termination of this credit facility. If, in the future, the Company determines that it would be beneficial to have a credit facility in place, the Company believes that alternative facilities are available. As at October 31, 2017, the Company had available credit at variable terms based on its securities holdings under an advisory arrangement, under which no borrowings have been made.

NOTE L - VALUATION ALLOWANCE ON DEFERRED TAX ASSETS	6 Months Ended
NOTE L - VALUATION ALLOWANCE ON DEFERRED TAX ASSETS	Oct. 31, 2017
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	NOTE L – VALUATION ALLOWANCE ON DEFERRED TAX ASSETS Deferred income taxes arise from temporary differences between the tax basis of assets and liabilities and their reported amounts in the financial statements, which will result in taxable or deductible amounts in the future. In evaluating our ability to recover deferred tax assets in the jurisdiction from which they arise, we consider all positive and negative evidence, including the reversal of deferred tax liabilities, projected future taxable income, tax planning strategies, and results of recent operations. The carrying value of the Company’s net deferred tax assets, assumes that the Company will be able to generate sufficient future taxable income in certain jurisdictions, based on estimates and assumptions. If these estimates and assumptions change in the future, the Company may be required to record an additional valuation allowances against its deferred tax assets resulting in additional income tax expense in the consolidated statement of operations, or conversely, to further reduce its existing valuation allowance resulting in less income tax expense. The Company evaluates the realizability of deferred tax assets and assesses the need for additional valuation allowance quarterly. The valuation allowance of approximately $6.4 million as of October 31, 2017 is intended to provide for uncertainty regarding the ultimate realization of U.S. state investment credits carryovers, and foreign net operating loss and tax credit carryovers.

NOTE B - DISCONTINUED OPERATIONS (Tables)

6 Months Ended

Oct. 31, 2017

Consolidated Statements of Operations and Comprehensive (Loss) Income [Member]

NOTE B - DISCONTINUED OPERATIONS (Tables) [Line Items]

Disposal Groups, Including Discontinued Operations [Table Text Block]

Summarized operating results for the Gillam discontinued operations, for the three and six months ended October 31, 2017 and 2016 respectively, are as follows:

	Six months						Three months
	Periods ended October 31,
	2017			2016			2017			2016
	(UNAUDITED)			(UNAUDITED)			(UNAUDITED)			(UNAUDITED)
	(In thousands except par value)
Revenues	$	1,955		$	2,294		$	943		$	1,448
Cost of Revenues		1,390			1,621			674			1,064
Gross Margin		565			673			269			384
Selling and administrative expenses		703			950			346			456
Research and development expenses		268			277			118			94
Operating Loss		(406	)		(554	)		(195	)		(166	)
Other income (expense):
Investment (loss) income
Other income (expense), net		(3	)		(3	)		(2	)		(2	)
Loss before provision for income taxes		(409	)		(557	)		(197	)		(168	)
Benefit for income taxes		1			-			5			-
Net Loss	$	(408	)	$	(557	)	$	(192	)	$	(168	)

Balance Sheets [Member]

NOTE B - DISCONTINUED OPERATIONS (Tables) [Line Items]

Disposal Groups, Including Discontinued Operations [Table Text Block]

The carrying amounts of assets and liabilities for the Gillam discontinued operations are as follows:

	October 31,		April 30,
	2017		2017

Cash and cash equivalents	$	794	$	575
Accounts receivable, net of allowance for doubtful accounts		2,525		3,202
Inventories, net		4,633		3,980
Prepaid expenses and other		205		408
Total current assets of discontinued operations	$	8,157	$	8,165
Property, plant and equipment, at cost, net of accumulated depreciation and amortization	$	547	$	555
Investments		15		14
Deferred taxes – non-current		-		-
Total non-current assets of discontinued operations	$	562	$	569

Accounts payable – trade	$	1,004	$	949
Accrued liabilities		974		1,300
Total current liabilities of discontinued operations		1,978		2,249
Deferred rent and other liabilities		1,387		1,215
Total non-current liabilities of discontinued operations	$	1,387	$	1,215

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1474-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=84176398&loc=SL51724579-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721663-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721659-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

+ Details

NOTE C - EARNINGS PER SHARE (Tables)

6 Months Ended

Oct. 31, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Reconciliation of the weighted average shares outstanding for basic and diluted Earnings Per Share are as follows:

	Six months				Three months
	Periods ended October 31,
	2017		2016		2017		2016
Weighted average shares outstanding:
Basic		8,830,486		8,771,494		8,834,945		8,780,633
Effect of dilutive securities		**		**		**		**
Diluted		8,830,486		8,771,494		8,834,945		8,780,633

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

Six months

Three months

Periods ended October 31,

2017

2016

2017

2016

Outstanding options and SARS excluded

- **

NOTE D - COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET (Tables)

6 Months Ended

Oct. 31, 2017

Contractors [Abstract]

Costs and Estimated Earnings in Excess of Billings, Net [Table Text Block]

At October 31, 2017 and April 30, 2017, costs and estimated earnings in excess of billings, net, consist of the following:

	October 31, 2017			April 30, 2017
	(In thousands)
Costs and estimated earnings in excess of billings	$	6,205		$	8,890
Billings in excess of costs and estimated earnings		(256	)		(926	)
Net asset	$	5,949		$	7,964

NOTE F - INVENTORIES (Tables)

6 Months Ended

Oct. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories, which are reported at the lower of cost or market, consist of the following:

	October 31, 2017		April 30, 2017
	(In thousands)
Raw Materials and Component Parts	$	18,552	$	17,702
Work in Progress		8,233		7,340
Finished Goods		4,425		4,009
	$	31,210	$	29,051

NOTE G - SEGMENT INFORMATION (Tables)

6 Months Ended

Oct. 31, 2017

Segment Reporting [Abstract]

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

	Six months						Three months
	Periods ended October 31,
	2017			2016			2017			2016
Revenues:
FEI-NY	$	15,740		$	17,715		$	6,579		$	7,733
FEI-Zyfer		7,865			6,596			3,593			4,249
less intersegment revenues		(2,245	)		(1,283	)		(835	)		(516	)
Consolidated revenues	$	21,360		$	23,028		$	9,337		$	11,466

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

Operating loss:
FEI-NY	$	(2,758	)	$	(1,887	)	$	(2,358	)	$	(1,714	)
FEI-Zyfer		1,275			463			584			648
Corporate		(203	)		(166	)		(92	)		(116	)
Consolidated operating loss	$	(1,686	)	$	(1,590	)	$	(1,866	)	$	(1,182	)

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

	October 31, 2017			April 30, 2017
Identifiable assets:
FEI-NY (approximately $1.6 million in China)	$	62,242		$	64,828
FEI-Zyfer		10,663			10,427
less intersegment balances		(12,797	)		(11,992	)
Corporate		52,594			50,056
Consolidated identifiable assets	$	112,702		$	113,319

NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Oct. 31, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

The cost, gross unrealized gains, gross unrealized losses, and fair market value of available-for-sale securities at October 31, 2017 and April 30, 2017, respectively are as follows (in thousands):

	October 31, 2017
	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Market Value
Fixed income securities	$	1,316	$	79	$	-	$	1,395
Equity securities		-		-		-		-
	$	1,316	$	79	$	-	$	1,395

	April 30, 2017
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Fixed income securities	$	1,516	$	60	$	-		$	1,576
Equity securities		5,230		1,248		(239	)		6,239
	$	6,746	$	1,308	$	(239	)	$	7,815

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

	Less than 12 months					12 Months or more					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
October 31, 2017
Fixed Income Securities	$	-	$	-		$	-	$	-		$	-	$	-
Equity Securities		-		-			-		-			-		-
	$	-	$	-		$	-	$	-		$	-	$	-
April 30, 2017
Fixed Income Securities	$	-	$	-		$	-	$	-		$	-	$	-
Equity Securities		219		(9	)		1,024		(230	)		1,243		(239	)
	$	219	$	(9	)	$	1,024	$	(230	)	$	1,243	$	(239	)

Investments Classified by Contractual Maturity Date [Table Text Block]

Maturities of fixed income securities classified as available-for-sale at October 31, 2017 are as follows, at cost (in thousands):

Current	$	-
Due after one year through five years		98
Due after five years through ten years		1,217
	$	1,315

NOTE B - DISCONTINUED OPERATIONS (Details) - Disposal Groups, Including Discontinued Operations - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Disposal Groups, Including Discontinued Operations [Abstract]
Revenues	$ 943	$ 1,955	$ 1,448		$ 2,294
Cost of Revenues	674	1,390	1,064		1,621
Gross Margin	269	565	384		673
Selling and administrative expenses	346	703	456		950
Research and development expenses	118	268	94		277
Operating Loss	(195)	(406)	(166)		(554)
Other income (expense), net	(2)	(3)	(2)		(3)
Loss before provision for income taxes	(197)	(409)	(168)		(557)
Benefit for income taxes	5	1	0		0
Net Loss	$ (192)	$ (408)	$ (167)	$ (408)	$ (557)

NOTE B - DISCONTINUED OPERATIONS (Details) - Disposal Groups, Including Discontinued Operations - USD ($) $ in Thousands	Oct. 31, 2017	Apr. 30, 2017	Oct. 31, 2016
Disposal Groups, Including Discontinued Operations [Abstract]
Cash and cash equivalents	$ 794	$ 575	$ 344
Accounts receivable, net of allowance for doubtful accounts	2,525	3,202
Inventories, net	4,633	3,980
Prepaid expenses and other	205	408
Total current assets of discontinued operations	8,157	8,165
Property, plant and equipment, at cost, net of accumulated depreciation and amortization	547	555
Investments	15	14
Deferred taxes – non-current	0	0
Total non-current assets of discontinued operations	562	569
Accounts payable – trade	1,004	949
Accrued liabilities	974	1,300
Total current liabilities of discontinued operations	1,978	2,249
Deferred rent and other liabilities	1,387	1,215
Total non-current liabilities of discontinued operations	$ 1,387	$ 1,215

NOTE C - EARNINGS PER SHARE (Details) - shares

3 Months Ended

6 Months Ended

Oct. 31, 2017

Oct. 31, 2016

Oct. 31, 2017

Oct. 31, 2016

NOTE C - EARNINGS PER SHARE (Details) [Line Items]

Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount

^[1]

Weighted Average Number Diluted Shares Outstanding Adjustment

117,209

190,418

129,245

184,793

Stock Appreciation Rights (SARs) [Member]

NOTE C - EARNINGS PER SHARE (Details) [Line Items]

Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount

1,353,750

1,265,375

[1]

For the six and three month periods ended October 31, 2017, dilutive securities are excluded since the inclusion of such shares would be antidilutive due to the net loss for the periods. The exercisable shares excluded are 1,353,750. The effect of dilutive securities for the periods would have been 129,245 and 117,209, respectively. For the six and three month periods ended October 31, 2016, dilutive securities are excluded since the inclusion of such shares would be antidilutive due to the net loss for the periods. The exercisable shares excluded are 1,265,375. The effect of dilutive securities for the periods would have been 184,793 and 190,418, respectively.

NOTE C - EARNINGS PER SHARE (Details) - Schedule of Earnings Per Share, Basic and Diluted - shares	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Weighted average shares outstanding:
Basic	8,834,945	8,780,633	8,830,486	8,771,494
Diluted	8,834,945	8,780,633	8,830,486	8,771,494

NOTE C - EARNINGS PER SHARE (Details) - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share - shares

3 Months Ended

6 Months Ended

Oct. 31, 2017

Oct. 31, 2016

Oct. 31, 2017

Oct. 31, 2016

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]

Outstanding options and SARS excluded

^[1]

[1]

NOTE D - COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
NOTE D - COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET (Details) [Line Items]
Revenues	$ 9,337	$ 11,466	$ 21,360	$ 23,028
Contracts Accounted for under Percentage of Completion [Member]
NOTE D - COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET (Details) [Line Items]
Revenues	$ 4,500	$ 5,100	$ 10,900	$ 12,400

NOTE D - COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS, NET (Details) - Costs and Estimated Earnings in Excess of Billings, Net - USD ($) $ in Thousands	Oct. 31, 2017	Apr. 30, 2017
Costs and Estimated Earnings in Excess of Billings, Net [Abstract]
Costs and estimated earnings in excess of billings	$ 6,205	$ 8,890
Billings in excess of costs and estimated earnings	(256)	(926)
Net asset	$ 5,949	$ 7,964

NOTE E - TREASURY STOCK TRANSACTIONS (Details) - shares	3 Months Ended	6 Months Ended
NOTE E - TREASURY STOCK TRANSACTIONS (Details) - shares	Oct. 31, 2017	Oct. 31, 2017
Disclosure Text Block Supplement [Abstract]
Defined Contribution Plan, Employer Discretionary Contribution, Shares	11,530	25,270
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		844

NOTE F - INVENTORIES (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Apr. 30, 2017
NOTE F - INVENTORIES (Details) [Line Items]
Inventory, Net	$ 31,210	$ 29,051
UNITED STATES
NOTE F - INVENTORIES (Details) [Line Items]
Inventory, Net	30,200	28,200
CHINA
NOTE F - INVENTORIES (Details) [Line Items]
Inventory, Net	$ 1,000	$ 800

NOTE F - INVENTORIES (Details) - Schedule of Inventory, Current - USD ($) $ in Thousands	Oct. 31, 2017	Apr. 30, 2017
Schedule of Inventory, Current [Abstract]
Raw Materials and Component Parts	$ 18,552	$ 17,702
Work in Progress	8,233	7,340
Finished Goods	4,425	4,009
	$ 31,210	$ 29,051

NOTE G - SEGMENT INFORMATION (Details)	6 Months Ended
NOTE G - SEGMENT INFORMATION (Details)	Oct. 31, 2017
NOTE G - SEGMENT INFORMATION (Details) [Line Items]
Number of Reportable Segments	2
Frequency Electronics Inc New York [Member]
NOTE G - SEGMENT INFORMATION (Details) [Line Items]
Number Of Principal Markets	3

NOTE G - SEGMENT INFORMATION (Details) - Reconciliation of Revenue from Segments to Consolidated - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Revenues:
Revenues	$ 9,337	$ 11,466	$ 21,360	$ 23,028
Frequency Electronics Inc New York [Member]
Revenues:
Revenues	6,579	7,733	15,740	17,715
Frequency Electronics Inc Zyfer [Member]
Revenues:
Revenues	3,593	4,249	7,865	6,596
Inter Segment [Member]
Revenues:
Revenues	$ (835)	$ (516)	$ (2,245)	$ (1,283)

NOTE G - SEGMENT INFORMATION (Details) - Reconciliation of Operating Profit (Loss) from Segments to Consolidated - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Operating loss:
Operating profit (loss)	$ (1,866)	$ (1,182)	$ (1,686)	$ (1,590)
Frequency Electronics Inc New York [Member]
Operating loss:
Operating profit (loss)	(2,358)	(1,714)	(2,758)	(1,887)
Frequency Electronics Inc Zyfer [Member]
Operating loss:
Operating profit (loss)	584	648	1,275	463
Corporate Segment [Member]
Operating loss:
Operating profit (loss)	$ (92)	$ (116)	$ (203)	$ (166)

NOTE G - SEGMENT INFORMATION (Details) - Schedule of Reconciliation of Assets from Segment to Consolidated - USD ($) $ in Thousands	Oct. 31, 2017	Apr. 30, 2017
Identifiable assets:
Identifiable Assets	$ 112,702	$ 113,319
Frequency Electronics Inc New York [Member]
Identifiable assets:
Identifiable Assets	62,242	64,828
Frequency Electronics Inc Zyfer [Member]
Identifiable assets:
Identifiable Assets	10,663	10,427
Inter Segment [Member]
Identifiable assets:
Identifiable Assets	(12,797)	(11,992)
Corporate Segment [Member]
Identifiable assets:
Identifiable Assets	$ 52,594	$ 50,056

NOTE G - SEGMENT INFORMATION (Details) - Schedule of Reconciliation of Assets from Segment to Consolidated (Parentheticals) - USD ($) $ in Millions	Oct. 31, 2017	Apr. 30, 2017
Frequency Electronics Inc New York [Member] \| CHINA
Segment Reporting, Asset Reconciling Item [Line Items]
Identifiable assets	$ 1.6	$ 1.6

NOTE H - INVESTMENT IN MORION, INC. (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
NOTE H - INVESTMENT IN MORION, INC. (Details) - USD ($)	Oct. 22, 2012	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Apr. 30, 2017	Apr. 30, 2016	Mar. 29, 2016
Morion Inc [Member]
NOTE H - INVESTMENT IN MORION, INC. (Details) [Line Items]
Cost Method Investment Ownership Percentage		4.60%		4.60%
Related Party Transaction, Purchases from Related Party				$ 170,000	$ 204,000
Revenue from Related Parties		$ 106,000	$ 123,000	182,000	10,000		$ 375,000
Proceeds from Dividends Received				51,000	100,000
Morion Inc [Member] \| Licensing Agreement [Member]
NOTE H - INVESTMENT IN MORION, INC. (Details) [Line Items]
Long-term Purchase Commitment, Description	The agreement required the Company to sell certain fully-depreciated production equipment previously owned by the Company and to provide training to Morion employees to enable Morion to produce a minimum of 5,000 rubidium oscillators per year.
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
License and Services Revenue				$ 182,000	$ 10,000
Morion Inc [Member] \| Balance for Transfer of License Due Once State Department Approves Removal of Certain Provisions [Member]
NOTE H - INVESTMENT IN MORION, INC. (Details) [Line Items]
License And Equipment Fee Receivable								$ 602,000
Licensing Agreement [Member] \| Morion Inc [Member]
NOTE H - INVESTMENT IN MORION, INC. (Details) [Line Items]
License and Services Revenue						$ 210,000	$ 392,500

NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	6 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds	$ 6.5
Available-for-sale Securities, Gross Realized Gains	$ 1.0	$ 1.0

NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Oct. 31, 2017	Apr. 30, 2017
NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items]
Cost	$ 1,316	$ 6,746
Gross Unrealized Gains	79	1,308
Gross Unrealized Losses	0	(239)
Fair Market Value	1,395	7,815
Fixed Income Securities [Member]
NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items]
Cost	1,316	1,516
Gross Unrealized Gains	79	60
Gross Unrealized Losses	0	0
Fair Market Value	1,395	1,576
Equity Securities [Member]
NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items]
Cost	0	5,230
Gross Unrealized Gains	0	1,248
Gross Unrealized Losses	0	(239)
Fair Market Value	$ 0	$ 6,239

NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Oct. 31, 2017	Apr. 30, 2017
NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Line Items]
Fair Value, Less than 12 months	$ 0	$ 219
Unrealized Losses, Less than 12 months	0	(9)
Fair Value, 12 Months or more	0	1,024
Unrealized Losses, 12 Months or more	0	(230)
Fair Value	0	1,243
Unrealized Losses	0	(239)
Fixed Income Securities [Member]
NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Line Items]
Fair Value, Less than 12 months	0	0
Unrealized Losses, Less than 12 months	0	0
Fair Value, 12 Months or more	0	0
Unrealized Losses, 12 Months or more	0	0
Fair Value	0	0
Unrealized Losses	0	0
Equity Securities [Member]
NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Line Items]
Fair Value, Less than 12 months	0	219
Unrealized Losses, Less than 12 months	0	(9)
Fair Value, 12 Months or more	0	1,024
Unrealized Losses, 12 Months or more	0	(230)
Fair Value	0	1,243
Unrealized Losses	$ 0	$ (239)

NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Investments Classified by Contractual Maturity Date - Fixed Income Securities [Member] $ in Thousands	Oct. 31, 2017 USD ($)
NOTE I - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Investments Classified by Contractual Maturity Date [Line Items]
Current	$ 0
Due after one year through five years	98
Due after five years through ten years	1,217
	$ 1,315

NOTE L - VALUATION ALLOWANCE ON DEFERRED TAX ASSETS (Details) $ in Millions	Oct. 31, 2017 USD ($)
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 6.4