Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Loss on sale of investments and technology investment losses Loss on Sale of Investments Schedule of Intangible Assets Intangible Asset and Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Range [Domain] Statistical Measurement [Domain] Patents and other assets, net Patent And Other Assets, Net Short-Term Debt, Type [Axis] Short-Term Debt, Type [Axis] Title of 12(b) Security Title of 12(b) Security Net Income available to common shareholders - Diluted Net Income (Loss) Available to Common Stockholders, Diluted Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-Sale [Table] Document Fiscal Year Focus Document Fiscal Year Focus Acquisition costs incurred Business Combination, Acquisition-Related Cost, Expense Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] BioCenturion BioCenturion LLC [Member] BioCenturion LLC Segment Reporting [Abstract] Accrued expenses and other current liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Expenses And Other Liability, Current Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accrued Expenses And Other Liability, Current Schedule of Assets or Liabilities Having Recurring Measurements Fair Value, Assets Measured on Recurring Basis [Table Text Block] Common stock Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One SAD Small Area Device [Member] Small Area Device Maximum restricted period Share-Based Compensation, Restricted Period Share-based compensation, restricted period. 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Recognized Asset Acquired, Property, Plant, and Equipment Asset-backed Securities Asset-Backed Securities [Member] Investments [Domain] Investments [Domain] Leases [Abstract] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Total Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Exclusive Licensing Agreement Licensing Agreements [Member] Shares granted, options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Aggregate Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] PEO Total Compensation Amount PEO Total Compensation Amount Total Patents & Other Intangible Assets, Accumulated Amortization Finite-Lived Intangible Patents And Assets, Accumulated Amortization Finite-Lived Intangible Patents And Assets, 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[Member] Allowance for credit losses on loans receivable Financing Receivable, Allowance for Credit Loss, Current Investments [Abstract] Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Entity Address, City or Town Entity Address, City or Town Windows Products Windows Product [Member] Windows Product Other Other Products [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Finite-lived intangible assets, net Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount (Level 2) Fair Value, Inputs, Level 2 [Member] Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Other comprehensive income, net of tax Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] U.S. UNITED STATES Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Adoption of New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Net Sales and Significant Expense Categories Included in Reportable Segment Operating Profit Segment Reporting [Table Text Block] Equity Attributable to Noncontrolling Interests Noncontrolling Interest [Member] Other comprehensive income before tax: Other Comprehensive Income (Loss), before Tax [Abstract] Municipal Bonds Municipal Bonds [Member] Premium Receiver Products Premium receiver Products [Member] Premium 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Technologies [Member] Guardian Optical Technologies 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Basic Earnings Per Share Earnings Per Share, Basic [Abstract] Equity Equity [Text Block] Income taxes payable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Income Tax Payable Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Income Tax Payable Security Exchange Name Security Exchange Name Debt instrument term Debt Instrument, Term Employee Stock Option Plan Employee Stock Option Plan [Member] eSight eSight Corporation [Member] eSight Corporation [Member] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Vaporsens, Inc. Vaporsens, Inc. [Member] Vaporsens, Inc. 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Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Total assets acquired, excluding cash Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Asset Including Goodwill Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Asset Including Goodwill Income taxes payable Business Combination, Liabilities Assumed, Income Taxes Payable Business Combination, Liabilities Assumed, Income Taxes Payable Schedule of Assets Acquired and Liabilities Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Purchases Payments to Acquire Debt Securities, Available-for-Sale Income Tax Disclosure [Abstract] Operating lease liabilities Business Combination, Liabilities Assumed, Operating Lease, Liability Business Combination, Liabilities Assumed, Operating 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[Domain] Segments [Domain] Restricted compensation expense Restricted Stock or Unit Expense Automotive Products Automotive Products Segment [Member] Sales proceeds Proceeds from Sale of Debt Securities, Available-for-Sale BioConnect BioConnect Inc. [Member] BioConnect Inc. 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[Member] Argil, Inc. 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[Member] Name Forgone Recovery, Individual Name Finished goods Inventory, Finished Goods, Net of Reserves Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Total transaction consideration, net Business Combination, Consideration Transferred and Preacquisition Equity Interest in Acquiree Statement [Line Items] Statement [Line Items] TOTAL ASSETS Assets Entity [Domain] Entity [Domain] Air-CraftGlass Air-CraftGlass Production BV [Member] Air-CraftGlass Production BV Loss relating to investment Gain (loss) relating to investment Equity Securities, FV-NI, Realized Gain (Loss) Operating Segments Operating Segments [Member] Weighted-avg. grant date fair value (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Reallocation of undistributed earnings Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Capital contributions, net Noncontrolling 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Compensation [Axis] Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Net income (loss) attributable to redeemable non-controlling interest Net loss attributable to non-controlling interest Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount ASA Asa Electronics, LLC And Subsidiary [Member] Asa Electronics, LLC And Subsidiary Plant and equipment additions Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Allocation: Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) [Abstract] Purchase of additional interest in BioCenturion LLC Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests In-Process R&D In Process Research and Development 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Transferred Additional  Paid-In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Total Debt Securities, Available-for-Sale, Unrealized Loss Position Indefinite-lived Intangible Assets by Major Class [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Short-term investments Short-Term Investments Impairment charges Goodwill, Impairment Loss Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Raw materials Inventory, Raw Materials, Net of Reserves Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Company Selected Measure Amount Company Selected Measure Amount Total liabilities assumed Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liability Business Combination, Provisional Information, Initial Accounting Incomplete, 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Operating Lease, Right-Of-Use Asset Business Combination, Recognized Assets Acquired, Operating Lease, Right-Of-Use Asset CURRENT ASSETS Assets, Current [Abstract] Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term GalvanEyes, LLC GalvanEyes, LLC [Member] GalvanEyes, LLC Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One ESPP discount rate recognized as compensation expense Share-Based Compensation Arrangement By Share-Based Payment Award, Discount Recognized As Compensation Expense PROVISION FOR INCOME TAXES Income tax effect Income Tax Expense (Benefit) Net income (loss) Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest COST OF GOODS SOLD Cost of Goods Sold: Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalent, Restricted Cash, and Restricted Cash 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Compensation Arrangement By Share-Based Payment Award Number Of Plans Share-Based Compensation Arrangement By Share-Based Payment Award Number Of Plans Proceeds from sale of plant and equipment Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Restatement Determination Date: Restatement Determination Date [Axis] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] 2022 Gentex Corporation Employee Stock Purchase Plan 2022 Gentex Corporation Employee Stock Purchase Plan [Member] 2022 Gentex Corporation Employee Stock Purchase Plan Liabilities assumed: Business Combination, Recognized Liability Assumed, Liability [Abstract] Japan JAPAN Stock Compensation Plan Share-Based Payment Arrangement [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Prepaid expenses and other current assets Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current Long-Term Investments: Other Long-Term Investments [Member]