Cash and cash equivalents Accounts receivable, net of allowances of $110 at April 30, 2024 and $111 at April 30, 2023 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 Total assets Identifiable Assets Accounts payable – trade Accrued liabilities Total current liabilities Deferred compensation Total liabilities Contingencies (Note 17) Preferred stock - $1.00 par value; authorized 600 shares, no shares issued and outstanding Preferred stock, par value (in Dollars per share) Preferred stock, shares authorized Preferred stock, shares issued Common stock - $1.00 par value; authorized 20,000 shares, 9,512 shares issued and 9,511 shares outstanding at April 30, 2024; 9,374 shares issued and 9,373 shares outstanding at April 30, 2023 Common stock, shares authorized Additional paid-in capital Accumulated deficit Common stock reacquired and held in treasury - at cost (1 shares at April 30, 2024 and April 30, 2023) Accumulated other comprehensive income (loss) Total stockholders’ equity Balance Balance Total liabilities and stockholders’ equity Revenues Revenue Cost of revenues Gross margin Selling and administrative expenses Research and development expenses Operating income (loss) Operating Income (Loss) Income (loss) on investments Interest expense Other income (expense), net Income (loss) before (benefit) provision from income taxes (Benefit) provision from income taxes Total (benefit) provision Net income (loss) Net income (loss) Basic and diluted earnings (loss) per share (in Dollars per share) Change in market value of marketable securities before reclassification, net of tax Items of other comprehensive income (loss) before reclassification, net of taxes Total unrealized gain on marketable securities, net of tax Comprehensive income (loss) Depreciation and amortization Provision for losses on accounts receivable, other assets and warranty reserve Loss on marketable securities Loss on sale of fixed and other assets Employee benefit plans expense Employee Benefits and Share-Based Compensation Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Accounts receivable Contract assets Inventories Prepaid expenses and other Other assets Net cash provided by operating activities Purchase of marketable securities Proceeds from sale or redemption of marketable securities Capital expenditures Net cash (used in) provided by investing activities Net cash used in financing activities Net increase in cash and cash equivalents and restricted cash Cash and cash equivalents and restricted cash at beginning of year Cash and equivalents and restricted cash at end of year Total cash and cash equivalents and restricted cash Interest Income taxes Balance (in Shares) Balance (in Shares) Contribution of stock to 401(k) plan Stock Issued During Period, Value, Employee Benefit Plan Stock-based compensation expense Equity Components [Axis] Geographical [Axis] Accounting Standards Update [Axis] Product and Service [Axis] Basic EPS Shares outstanding (weighted average) Diluted EPS Shares outstanding Raw Materials and Component Parts Work in Progress Finished Goods Buildings and building improvements Machinery, equipment and furniture Less accumulated depreciation Total lease liabilities Present value of future lease payments Total lease payments Vacation and other compensation Incentive compensation Payroll taxes Warranty reserve Commissions Other Federal State Current (benefit) provision Federal State Deferred tax (benefit) provision Statutory rate State and local tax Valuation allowance on deferred tax assets Nondeductible expenses Uncertain tax positions Nontaxable life insurance cash value increase Tax credits Change in tax rate Other items Employee benefits Inventory Accounts receivable Tax credits Other assets Capital loss carry-forward Net operating loss carryforwards Total deferred tax asset Property, plant and equipment Other liabilities Deferred state income tax Net deferred tax asset Valuation allowance Balance at the beginning of the fiscal year Balance at the end of the fiscal year Lapse in statute of limitations Consolidation Items [Axis] Segments [Axis] Balance at beginning of year Balance at end of year Warranty costs incurred Product warranty accrual Total other comprehensive income (loss), net of taxes Other comprehensive income, net of tax ASSETS: Current assets: Allowances (in Dollars) Right-of-use assets – operating leases Operating lease ROU assets Restricted cash LIABILITIES AND STOCKHOLDERS’ EQUITY: Current liabilities: Loss provision accrual Operating lease liability, current portion Operating lease liabilities (short-term) Less current obligations under leases Contract liabilities Deferred taxes Operating lease liability, non-current portion Operating lease liabilities (long-term) Long-term lease obligations Other liabilities Stockholders’ equity: Common stock, par value (in Dollars per share) Common stock shares issued Common stock shares outstanding Common stock reacquired and held in treasury, shares Other income (expense): Net income (loss) per common share: Weighted average shares outstanding: Basic and diluted (in Shares) Consolidated Statements of Comprehensive Income (Loss) Unrealized gain on marketable securities: Cash flows from operating activities: Adjustments to reconcile net income (loss) to net cash provided by operating activities: Provision for inventory reserve Loss provision accrual Changes in operating assets and liabilities: Accounts payable - trade Accrued liabilities Contract liabilities Prepaid income taxes Other liabilities Cash flows from investing activities: Cash flows from financing activities: Supplemental disclosures of cash flow information: Cash paid during the year for: Income taxes Cash refund during the year for: Contribution of stock to 401(k) plan (in Shares) Stock Issued During Period, Shares, Employee Benefit Plan (in Shares) Stock-based compensation expense (in Shares)