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Large-Scale Optical Large Scale Optical [Member] Large scale optical. Revenue Recognition and Deferred Revenue [Abstract] Deferred Compensation Obligation [Member] Deferred Compensation Obligation [Member] Deferred compensation obligation. Entity Filer Category Entity Filer Category Common Stock [Member] Common Stock [Member] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Schedule of finite lived identifiable intangible assets Finite-Lived Intangible Assets, Net [Abstract] Additions charged to costs and expenses Accounts Receivable, Credit Loss Expense (Reversal) Costs and earnings on contracts in excess of billings Contract with Customer, Asset, after Allowance for Credit Loss, Current Aggregate intrinsic value, Vested or expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Noncash Activity Noncash Investing and Financing Items [Abstract] Earnings per share - diluted Earnings Per Share, Diluted [Abstract] Revenue recognized related to prior satisfaction of performance obligations Contract with Customer, Performance Obligation Satisfied in Previous Period Other income, net Nonoperating Income (Expense) Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Schedule of operating lease liability Lessee, Operating Lease, Liability, Maturity [Table Text Block] Weighted average basic shares outstanding Basic earnings per share – weighted average common shares outstanding Weighted Average Number of Shares Outstanding, Basic September 2025 August 2025 [Member] August 2025 [Member] Deferred benefit from New Market Tax Credit transactions Accumulated Deferred Investment Tax Credit Revenue, Receivables and Contract Assets and Liabilities Revenue from Contract with Customer [Text Block] Lease assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Additional paid-in capital Additional Paid in Capital Finite-Lived Intangible Asset, Expected Amortization, Year One Finite-Lived Intangible Asset, Expected Amortization, Year One Income tax expense Income Tax Expense (Benefit) Cash, cash equivalents and restricted cash at beginning of year Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Earnings per share - diluted Earnings Per Share, Diluted Local Phone Number Local Phone Number Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Entity Address, Address Line One Entity Address, Address Line One Deferred compensation Other Liabilities, Fair Value Disclosure Municipal and corporate bonds Short-term Investments, Municipal And Corporate Bonds Short-term Investments, Municipal And Corporate Bonds Contract liabilities Contract with Customer, Liability Entity Emerging Growth Company Entity Emerging Growth Company Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Indefinite-lived Intangible Assets (Excluding Goodwill) Indefinite-lived Intangible Assets (Excluding Goodwill) Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Deferred income taxes Deferred Income Tax Expense (Benefit) Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Nonvested share award transactions, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] June 2023 May 2023 [Member] May 2023 [Member] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Total fair value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Sales and operating income data Segment Reporting Information, Profit (Loss) [Abstract] Dividends, Common Stock, Cash Dividends, Common Stock, Cash Retained Earnings [Member] Retained Earnings [Member] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Net cash used by investing activities Net Cash Provided by (Used in) Investing Activities Weighted average remaining contractual life, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Less: allowance for credit losses Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss Award Type [Domain] Award Type [Domain] Investments [Domain] Investments [Domain] Trading Symbol Trading Symbol Weighted average exercise price, Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Performance obligations expected to be satisfied Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Earnings Per Share Earnings Per Share [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Current liabilities Liabilities, Current [Abstract] Entity Shell Company Entity Shell Company Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Weighted average exercise price, Vested or expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Income Tax Contingency [Table] Income Tax Contingency [Table] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Earnings per share - basic Earnings Per Share, Basic [Abstract]