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Earnings Per Share (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic Earnings Per Share        
Net Income Attributable to Gentex Corporation $ 100,967,910 $ 122,549,041 $ 291,881,539 $ 316,820,194
Less: Dividends and undistributed earnings allocated to participating securities 1,523,892 1,604,095 4,277,469 4,418,133
Net Income available to common shareholders $ 99,444,018 $ 120,944,946 $ 287,604,070 $ 312,402,061
Basic weighted average shares outstanding (in shares) 215,944,553 226,002,347 219,331,486 226,646,541
Net income per share - Basic (in dollars per share) [1] $ 0.46 $ 0.54 $ 1.31 $ 1.38
Diluted Earnings Per Share        
Allocation of Net Income used in basic computation $ 99,444,018 $ 120,944,946 $ 287,604,070 $ 312,402,061
Reallocation of undistributed earnings 257 1,288 238 5,183
Net Income available to common shareholders - Diluted $ 99,444,275 $ 120,946,234 $ 287,604,308 $ 312,407,244
Number of shares used in basic computation (in shares) 215,944,553 226,002,347 219,331,486 226,646,541
Additional weighted average dilutive common stock equivalents (in shares) 50,236 239,337 17,195 363,391
Diluted weighted average shares outstanding (in shares) 215,994,789 226,241,684 219,348,681 227,009,932
Net Income per share - Diluted (in dollars per share) [1] $ 0.46 $ 0.53 $ 1.31 $ 1.38
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive (in shares) 2,664,948 1,619,446 3,000,159 625,410
[1]
(1) Earnings Per Share has been adjusted to exclude the portion of net income allocated to participating securities as a result of share-based payment awards.