Cash and cash equivalents Accounts receivable, net of allowance for doubtful accounts of $111 at July 31, 2023 and April 30, 2023 Allowance for doubtful accounts (in Dollars) Contract assets Inventories Prepaid income taxes Prepaid expenses and other Total current assets Property, plant, and equipment, net 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 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 portion Operating lease liabilities (long-term) Long-term lease obligations Other liabilities Total liabilities 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, 9,391 shares issued and 9,390 shares outstanding at July 31, 2023; 9,374 shares issued and 9,373 shares outstanding at April 30, 2023 Common stock, par value (in Dollars per share) Common stock shares issued Additional paid-in capital Accumulated deficit 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 income Interest expense Income (loss) before provision for income taxes Provision for income taxes Net Income (loss) Net Income (loss) Net income (loss) Basic and diluted income (loss) per share (in Dollars per share) Change in market value of marketable securities before reclassification, net of tax Total unrealized gain on marketable securities, net of tax Comprehensive income (loss) Non-cash charges to earnings Net changes in operating assets and liabilities Net cash used in operating activities Proceeds on redemption of marketable securities Purchase of marketable securities Purchase of fixed assets Net cash used in investing activities Net cash used in financing activities Net decrease 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 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] 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 income (loss) per common share: Weighted average shares outstanding: Basic and diluted (in Shares) Condensed Consolidated Statements of 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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 Compensation and Employee Benefit Plans [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, to be Paid, Maturity [Table Text Block] Remainder of 2024 2025 2026 2027 2028 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] Accounting Standards Update and Change in Accounting Principle [Text Block] Debt Disclosure [Text Block] Income Tax Disclosure [Text Block] Contract Liabilities Less imputed interest 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] Principal Transaction Revenue, Description of Reporting Category [Axis] Change in Accounting Estimate by Type [Axis] Nature of Expense [Axis] Investment, Name [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Increase (Decrease) in Contract with Customer, Asset Increase (Decrease) in Contract with Customer, Liability Loss on Contracts Deferred Compensation Arrangement with Individual, Compensation Expense Deferred Compensation Arrangement with Individual, Distribution Paid 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 Cost Method Investment Ownership Percentage Contract Liabilities [Member] Contracts Accounted for under Percentage of Completion [Member] Interest Expense [Member] 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] Product and Service [Domain] Consolidation Items [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] PrincipleTransactionRevenueDescriptionOfReportingCategoryDomain [Domain] Change in Accounting Estimate, Type [Domain] CONTRACT (LIABILITIES) ASSETS (Details) [Table] CONTRACT (LIABILITIES) ASSETS (Details) [Line Items] Interim Period, Costs Not Allocable [Domain] EMPLOYEE BENEFIT PLANS (Details) [Table] EMPLOYEE BENEFIT PLANS (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] Carry amount, as of the balance sheet date, of the cash surrender value of life insurance and cash held in trust. 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. 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