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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share Basic and Diluted | The following table sets forth the computation of basic and diluted net income per common share under the two-class method for the three and nine months ended September 30, 2025 and September 30, 2024:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 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 | 215,944,553 |  |  | 226,002,347 |  |  | 219,331,486 |  |  | 226,646,541 |
Net Income per share - Basic | $ | 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 | 215,944,553 |  |  | 226,002,347 |  |  | 219,331,486 |  |  | 226,646,541 |
Additional weighted average dilutive common stock equivalents | 50,236 |  |  | 239,337 |  |  | 17,195 |  |  | 363,391 |
Diluted weighted average shares outstanding | 215,994,789 |  |  | 226,241,684 |  |  | 219,348,681 |  |  | 227,009,932 |
Net Income per share - Diluted | $ | 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 | 2,664,948 |  |  | 1,619,446 |  |  | 3,000,159 |  |  | 625,410 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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