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Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net | $ 234,229,803 | $ 239,189,627 | [1]
Patents and Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible patents and assets, gross | 437,921,784 | 438,128,104 |
Finite-Lived Intangible Patents and Assets, Accumulated Amortization | (190,847,756) | (185,781,262) |
Intangible patents and assets, net | 247,074,028 | 252,346,842 |
Gentex Patents |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 39,290,691 | 39,362,187 |
Finite-lived intangible assets, accumulated amortization | (26,730,389) | (26,506,155) |
Finite-lived intangible assets, net | 12,560,302 | 12,856,032 |
Vaporsens Technology Licenses |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 351,290 | 351,290 |
Finite-lived intangible assets, accumulated amortization | (67,367) | (50,107) |
Finite-lived intangible assets, net | 283,923 | 301,183 |
HomeLink® Technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 180,000,000 | 180,000,000 |
Finite-lived intangible assets, accumulated amortization | (127,500,000) | (123,750,000) |
Finite-lived intangible assets, net | $ 52,500,000 | $ 56,250,000 |
Finite-lived intangible asset, useful life | 12 years | 12 years |
Existing Customer Platforms |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | $ 43,000,000 | $ 43,000,000 |
Finite-lived intangible assets, accumulated amortization | (36,550,000) | (35,475,000) |
Finite-lived intangible assets, net | $ 6,450,000 | $ 7,525,000 |
Finite-lived intangible asset, useful life | 10 years | 10 years |
Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, accumulated amortization | $ (164,050,000) | $ (159,225,000) |
Intangible assets, gross | 398,279,803 | 398,414,627 |
Intangible assets, net | 234,229,803 | 239,189,627 |
HomeLink® Trade Names and Trademarks |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 52,000,000 | 52,000,000 |
HomeLink® Trade Names and Trademarks | Guardian Optical Technologies |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 1,302,844 | 1,384,857 |
Exclusive Licensing Agreement |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 96,000,000 | 96,000,000 |
In Process Research and Development | Vaporsens Inc |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 11,000,000 | 11,000,000 |
In Process Research and Development | Argil, Inc. |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 6,278,132 | 6,278,132 |
In Process Research and Development | Air-CraftGlass |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | 1,507,778 | 1,507,778 |
In Process Research and Development | Guardian Optical Technologies |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets | $ 7,191,049 | $ 7,243,860 |
[1] | The condensed consolidated balance sheet at December 31, 2021 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements.

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