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.