Cash and cash equivalents Marketable securities Accounts receivable, net of allowance for doubtful accounts of $111 at January 31, 2023 and April 30, 2022 Allowance for doubtful accounts (in Dollars) Contract assets Inventories, net Prepaid income taxes Prepaid expenses and other Total current assets Property, plant and equipment, at cost, net of accumulated depreciation and amortization Goodwill Cash surrender value of life insurance Other assets Right-of-Use assets – operating leases Operating lease ROU assets Total assets Identifiable Assets Accounts payable – trade Accrued liabilities Loss provision accrual Operating lease liability, current portion Operating lease liabilities (short-term) Less current obligations under leases Total current liabilities Deferred compensation Operating lease liability – non-current Operating lease liabilities (long-term) Long-term lease obligations Other liabilities Total liabilities Commitments and contingencies Preferred stock - $1.00 par value; authorized 600 shares, no shares issued Preferred stock, par value (in Dollars per share) Common stock - $1.00 par value; authorized 20,000 shares, 9,354 shares issued and 9,353 shares outstanding at January 31, 2023; 9,298 shares issued and 9,297 shares outstanding at April 30, 2022 Common stock, par value (in Dollars per share) Common stock shares issued Additional paid-in capital Accumulated deficit Accumulated other comprehensive income Total stockholders’ equity Balance Balance Total liabilities and stockholders’ equity Revenues Revenues Revenue Cost of revenues Gross margin Selling and administrative expenses Research and development expenses Operating income (loss) Consolidated operating income (loss) Investment (expense) income, net Interest expense Other income (expense), net Loss before provision for income taxes Provision for income taxes Net loss Net loss Net income (loss) Basic and diluted loss per share (in Dollars per share) Change in market value of marketable securities before reclassification, net of tax Total unrealized gain (loss) on marketable securities, net of tax Comprehensive income (loss) Non-cash charges to earnings Net changes in operating assets and liabilities Net cash provided by operating activities Proceeds on redemption of marketable securities Purchase of marketable securities Purchase of fixed assets and other assets Net cash provided by (used in) investing activities Net cash used in financing activities Net increase in cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Interest Income taxes Balance (in Shares) Balance (in Shares) Equity Components [Axis] Diluted EPS Shares outstanding Net (liability) asset Raw materials and component parts Work in progress Finished goods Total lease liabilities Present value of future lease payments Total lease payments Segments [Axis] Consolidation Items [Axis] Product and Service [Axis] Financial Instrument [Axis] Document Type Document Quarterly Report Document Period End Date Document Transition Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Amendment Flag Current Fiscal Year End Date Document Fiscal Period Focus Document Fiscal Year Focus Entity Central Index Key ASSETS: Current assets: LIABILITIES AND STOCKHOLDERS’ EQUITY: Current liabilities: Contract liabilities Deferred taxes Stockholders’ equity: Preferred stock - shares authorized Preferred stock - shares issued Common stock - authorized shares Common stock - shares outstanding Common stock reacquired and held in treasury - share Other income (expense): Net loss per common share: Weighted average shares outstanding: Basic and diluted (in Shares) Condensed Consolidated Statements of Comprehensive Income (Loss) Unrealized gain (loss) on marketable securities: Cash flows from operating activities: Cash flows from investing activities: Cash flows from financing activities: Supplemental disclosures of cash flow information: Cash paid during the period for: Income taxes Cash refunded during the period for: Contribution of stock to 401(k) plan Contribution of stock to 401(k) plan (in Shares) Stock-based compensation expense Other comprehensive income (loss), net of tax Stock-based compensation expense (in Shares) Exercise of stock options and stock appreciation rights - net of shares tendered for exercise price Exercise of stock options and stock appreciation rights - net of shares tendered for exercise price (in Shares) Common stock reacquired and held in treasury - at cost (1 share at January 31, 2023 and April 30, 2022) Reclassification adjustment for realized gains (losses) included in net income, net of tax Payment of Dividend Dividends paid Common Stock [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Treasury Stock [Member] AOCI Attributable to Parent [Member] Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Earnings Per Share [Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Weighted average shares outstanding: Basic EPS Shares outstanding (weighted average) Effect of Dilutive Securities Long-Term Contracts or Programs Disclosure [Text Block] Costs and Estimated Earnings in Excess of Billings, Net [Table Text Block] Contract Assets Shareholders' Equity and Share-Based Payments [Text Block] Inventory Disclosure [Text Block] Schedule of Inventory, Current [Table Text Block] Lessee, Operating Leases [Text Block] Lease, Cost [Table Text Block] Assets Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Remainder of 2023 2024 2025 2026 2027 Thereafter Segment Reporting Disclosure [Text Block] Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Revenues: Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Operating income (loss): Reconciliation of Assets from Segment to Consolidated [Table Text Block] Identifiable assets: Disaggregation of Revenue [Table Text Block] Revenue from External Customers by Products and Services [Table Text Block] Revenues by Product Line: Investment Holdings [Text Block] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Cost Gross Unrealized Gains Fair Market Value Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Fair Value, Less than 12 months Fair Value, 12 Months or more Fair Value April 30, 2022 Accounting Standards Update and Change in Accounting Principle [Text Block] Debt Disclosure [Text Block] Income Tax Disclosure [Text Block] Contract Liabilities Less imputed interest Gross Unrealized Losses Unrealized Losses, Less than 12 months Unrealized Losses, 12 Months or more Unrealized Losses Frequency Electronics Inc New York [Member] Frequency Electronics Inc Zyfer [Member] Inter Segment [Member] Corporate Segment [Member] Intersegment Eliminations [Member] POC Revenue [Member] POT Revenue [Member] Satellite Revenue [Member] Government Non-Space Revenue [Member] Other Commercial & Industrial Revenue [Member] Fixed Income Securities [Member] Change in Accounting Estimate by Type [Axis] Geographical [Axis] Investment, Name [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Loss on Contracts Contract Loss Reduction Stock Issued During Period, Shares, Treasury Stock Reissued Common Stock, Dividends, Per Share, Cash Paid Dividends, Cash Dividends Payable, Date to be Paid Dividends Payable, Date Declared Dividends Payable, Date of Record Inventory Valuation Reserves Operating Lease, Expense Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Discount Rate, Percent Number of Reportable Segments Number Of Principal Markets Related Party Transaction, Purchases from Related Party Proceeds from Dividends Received Cost Method Investment Ownership Percentage Other than Temporary Impairment Losses, Investments Proceeds from Sale of Debt Securities, Available-for-Sale Debt Securities, Realized Gain (Loss) Contracts Accounted for under Percentage of Completion [Member] UNITED STATES Morion Inc [Member] Equity Component [Domain] Statement [Table] Statement [Line Items] Segments [Domain] Reconciliation of Revenue from Segments to Consolidated [Table] Segment Reporting, Revenue Reconciling Item [Line Items] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Reconciliation of Assets from Segment to Consolidated [Table] Segment Reporting, Asset Reconciling Item [Line Items] Consolidation Items [Domain] Product and Service [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Line Items] Revenue from External Customers by Products and Services [Table] Revenue from External Customer [Line Items] Financial Instruments [Domain] FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Table] FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Schedule of Available-for-sale Securities Reconciliation [Line Items] FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table] FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Line Items] Change in Accounting Estimate, Type [Domain] CONTRACT (LIABILITIES) ASSETS, NET (Details) [Table] CONTRACT (LIABILITIES) ASSETS, NET (Details) [Line Items] Geographical [Domain] INVENTORIES, NET (Details) [Table] INVENTORIES, NET (Details) [Line Items] SEGMENT INFORMATION (Details) [Table] SEGMENT INFORMATION (Details) [Line Items] Investment, Name [Domain] INVESTMENT IN MORION, INC. (Details) [Table] INVESTMENT IN MORION, INC. (Details) [Line Items] This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. Carry amount, as of the balance sheet date, of the cash surrender value of life insurance and cash held in trust. Reduction of contract loss. Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. The percentage of ownership in the investee accounted for under the cost method of accounting. Tabular disclosure of information pertaining to costs and estimated earnings in excess of billings, net. Number of Principal Markets The average number of shares or units issued and outstanding that are used in calculating basic and diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity. Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity. Product or service. Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity. Name of investment. Product or service. Type of revenue. Type of revenue. Product or service. Other Noncash Income (Expense) Lessee, Operating Lease, Liability, Undiscounted Excess Amount Reconciliation Of Revenue From Segments To Consolidated Abstract Frequency Electronics Inc Zyfer Member Liabilities POTRevenue Member Statement of Stockholders' Equity [Abstract] Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Entity Small Business Entity File Number Entity Address, City or Town Assets [Abstract] POCRevenue Member Disclosure Text Block [Abstract] Contract with Customer, Asset, before Allowance for Credit Loss Lessee, Operating Lease, Liability, to be Paid, Year One Lessee, Operating Lease, Liability, to be Paid, Year Four Investment Holdings [Text Block] Contract with Customer, Liability Debt Securities, Available-for-Sale, Unrealized Loss Cash Flows From Investing Activities Abstract Available For Sale Securities Continuous Unrealized Loss Position Fair Value1 Entity Filer Category Weighted Average Number of Shares Outstanding, Basic Disaggregation of Revenue [Abstract] Proceeds from Dividends Received Stockholders' Equity Attributable to Parent [Abstract] Assets Treasury Stock, Value Revenues [Abstract] Entity Address, State or Province Preferred Stock, Shares Authorized Local Phone Number UNITED STATES Loss on Contracts Income Taxes Paid, Net Number Of Principal Markets Income Statement [Abstract] Net Cash Provided by (Used in) Investing Activities Entity Common Stock, Shares Outstanding Lessee, Operating Leases [Text Block] Other Comprehensive Income (Loss), Net of Tax Morion Inc Member Retained Earnings [Member] Preferred Stock, Shares Issued Document Transition Report Cash Flows From Financing Activities Abstract Unlabeled Abstract16 Unlabeled Abstract17 Treasury Stock, Shares Proceeds from Sale of Debt Securities, Available-for-Sale Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value1 Schedule Of Reconciliation Of Assets From Segment To Consolidated Abstract Accounting Policies [Abstract] Disclosure Text Block Supplement [Abstract] Entity Shell Company Other Commercial Industrial Revenue Member Common Stock [Member] Entity Incorporation, State or Country Code Security Exchange Name Inventory Disclosure [Abstract] Entity Address, Address Line One Debt Securities, Available-for-Sale, Amortized Cost Common Stock, Shares, Outstanding Lessee, Operating Lease, Liability, to be Paid, Year Five Related Party Transaction, Purchases from Related Party Other than Temporary Impairment Losses, Investments Lessee Operating Lease Liability Maturity Abstract Title of 12(b) Security Additional Paid-in Capital [Member] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract] Common Stock, Dividends, Per Share, Cash Paid Revenue From External Customers By Products And Services Abstract Debt Securities, Realized Gain (Loss) Payments to Acquire Property, Plant, and Equipment Shareholders' Equity and Share-Based Payments [Text Block] Identifiable Assets Abstract Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Financing Activities Long-Term Contracts or Programs Disclosure [Text Block] Debt Securities, Available-for-Sale, Unrealized Gain Contracts Accounted for under Percentage of Completion [Member] Condensed Consolidated Statements Of Comprehensive Income Loss Abstract Corporate Segment [Member] Entity Registrant Name Investments, Debt and Equity Securities [Abstract] Dividends Payable, Date of Record Operating Lease, Weighted Average Discount Rate, Percent Debt Disclosure [Text Block] City Area Code Lessee, Operating Lease, Liability, to be Paid, Year Three Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Contract Loss Reduction Amendment Flag Schedule Of Inventory Current Abstract Operating Income (Loss) Entity Central Index Key Unlabeled Abstract10 Unlabeled Abstract11 Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Unlabeled Abstract14 Unlabeled Abstract15 Operating Lease, Liability Unlabeled Abstract12 Unlabeled Abstract13 Treasury Stock [Member] Liabilities [Abstract] Liabilities, Current [Abstract] Number of Reportable Segments Other Income Expense Abstract Payments of Dividends Proceeds from Income Tax Refunds Satellite Revenue Member Cash Paid During The Period For Abstract Net Loss Per Common Share Abstract Comprehensive Income (Loss), Net of Tax, Attributable to Parent Cash Refunded During The Period For Abstract Contract With Customer Asset Net1 Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Income Tax Disclosure [Abstract] Unlabeled Abstract2 Unlabeled Abstract1 Statement of Cash Flows [Abstract] Interest Expense Unlabeled Abstract4 AOCI Attributable to Parent [Member] Investment Holdings Abstract Unlabeled Abstract3 Dividends Payable, Date Declared Unlabeled Abstract0 Unlabeled Abstract9 Income Tax Disclosure [Text Block] Segment Reporting [Abstract] Unlabeled Abstract6 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Unlabeled Abstract5 Unlabeled Abstract8 Operating Income (Loss) [Abstract] Unlabeled Abstract7 Deferred Income Tax Liabilities, Net Schedule Of Earnings Per Share Basic And Diluted Abstract Stock Issued During Period, Value, Employee Benefit Plan Liabilities and Equity [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Inventory Disclosure [Text Block] Debt Securities, Available-for-Sale, Current Disaggregation of Revenue [Table Text Block] Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value1 Assets Abstract0 Stock Issued During Period, Value, Stock Options Exercised Assets, Current [Abstract] Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Earnings Per Share [Abstract] Current Fiscal Year End Date Unlabeled Abstract Operating Lease, Weighted Average Remaining Lease Term Contract with Customer, Liability, Current Common Stock, Shares Authorized Costs And Estimated Earnings In Excess Of Billings Net Table Text Block Fixed Income Securities [Member] Investmentexpense Income Inter Segment Member Lessee, Operating Lease, Liability, to be Paid, Year Two April302022 Abstract Earnings Per Share [Text Block] Accounting Standards Update and Change in Accounting Principle [Abstract] Stockholders' Equity Attributable to Parent Gross Profit Debt Securities Available For Sale Unrealized Loss Position Fair Value Abstract Frequency Electronics Inc New York Member Liabilities and Equity Schedule Of Available For Sale Securities Reconciliation Abstract Lessee, Operating Lease, Liability, to be Paid Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Unrealized Gain Loss On Marketable Securities Abstract Liabilities, Current Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Assets, Current Segment Reporting Disclosure [Text Block] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Document Fiscal Year Focus Statement of Financial Position [Abstract] Dividends, Common Stock, Cash Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Emerging Growth Company Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Entity Tax Identification Number Entity Address, Postal Zip Code Document Type Dividends Payable, Date to be Paid Entity Current Reporting Status Lease, Cost [Table Text Block] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Weighted Average Number of Shares Outstanding, Diluted Document Fiscal Period Focus Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Accounting Standards Update and Change in Accounting Principle [Text Block] Weighted Average Number Of Diluted Shares Outstanding1 Intersegment Eliminations [Member] Entity Interactive Data Current Stock Issued During Period, Shares, Employee Benefit Plan Cash Flows From Operating Activities Abstract Debt Disclosure [Abstract] Weighted Average Shares Outstanding Abstract Schedule of Inventory, Current [Table Text Block] Dividends, Cash Weighted Average Number of Shares Outstanding, Diluted, Adjustment Document Quarterly Report Contractors [Abstract] Cost Method Investment Ownership Percentage Lease, Cost [Abstract] Revenue from External Customers by Products and Services [Table Text Block] Trading Symbol Inventory Valuation Reserves Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Costs And Estimated Earnings In Excess Of Billings Net Abstract Reconciliation of Assets from Segment to Consolidated [Table Text Block] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Supplemental Disclosures Of Cash Flow Information Abstract Shares, Outstanding Revenues By Product Line Abstract Document Period End Date OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Payments to Acquire Marketable Securities Increase (Decrease) in Operating Capital Government Non Space Revenue Member Operating Lease, Expense Weighted Average Shares Outstanding Abstract0 Stock Issued During Period, Shares, Treasury Stock Reissued