Cash and cash equivalents Accounts receivable, net of allowances of $110 at April 30, 2025 and at April 30, 2024 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 and assets held in trust Other assets Total assets Identifiable assets Accounts payable – trade Accrued liabilities Total current liabilities Deferred compensation Total liabilities Contingencies (Note 15) 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, 9,717 shares issued and 9,704 shares outstanding at April 30, 2025; 9,512 shares issued and 9,511 shares outstanding at April 30, 2024 Common stock, shares authorized Additional paid-in capital Retained earnings (accumulated deficit) Common stock reacquired and held in treasury - at cost (13 shares at April 30, 2025 and 1 share at April 30, 2024) 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 Operating income Income on investments Interest expense Other expense, net Income before benefit from income taxes Benefit from income taxes Total benefit Total benefit Net income Net income Depreciation and amortization Provision for losses on accounts receivable, other assets and warranty reserve Loss provision accrual 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 (used in) provided by operating activities Capital expenditures Net cash used in investing activities Purchase of treasury stock Net cash used in financing activities Net (decrease) increase in cash and cash equivalents and restricted cash Cash and cash equivalents and restricted cash at beginning of year Cash and cash equivalents and restricted cash at end of year Total cash and cash equivalents and restricted cash Interest Balance (in Shares) Balance (in Shares) Equity Components [Axis] Geographical [Axis] Accounting Standards Update [Axis] Product and Service [Axis] 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 provision (benefit) Federal State Deferred tax benefit Statutory rate State and local tax Valuation allowance on deferred tax assets Nondeductible expenses FDII 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 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 ASSETS: Current assets: Allowances (in Dollars) Deferred taxes Right-of-use assets – operating leases Operating lease ROU assets Restricted cash LIABILITIES AND STOCKHOLDERS’ EQUITY: Current liabilities: Loss provision accrual Income taxes payable 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 Stockholders’ equity: Preferred stock, shares outstanding 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 per common share: Basic income per share (in Dollars per share) Diluted income per share (in Dollars per share) Weighted average shares outstanding: Basic (in Shares) Basic EPS Shares outstanding (weighted average) Diluted (in Shares) Diluted EPS Shares outstanding Cash flows from operating activities: Adjustments to reconcile net income to net cash (used in) provided by operating activities: Provision for inventory reserve Deferred taxes 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 Contribution of stock to 401(k) plan Stock Issued During Period, Value, Employee Benefit Plan Contribution of stock to 401(k) plan (in Shares) Stock Issued During Period, Shares, Employee Benefit Plan (in Shares) Stock-based compensation expense Stock-based compensation expense (in Shares) Exercise of stock options Exercise of stock options (in Shares) Shares withheld on employee taxes on vested equity awards Shares withheld on employee taxes on vested equity awards (in Shares) Non-cash lease expense Payment of dividend Dividends Common Stock [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Treasury Stock, Common [Member] AOCI Attributable to Parent [Member] Significant Accounting Policies [Text Block] Disaggregation of Revenue [Table Text Block] Revenue from External Customers by Products and Services [Table Text Block] Revenues by Product Line: Earnings Per Share [Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Weighted average shares outstanding: Effect of Dilutive Securities Long-Term Contracts or Programs Disclosure [Text Block] Inventory Disclosure [Text Block] Schedule of Inventory, Current [Table Text Block]