Earnings Per Share (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Basic Earnings Per Share | ||||||
| Net Income Attributable to Gentex Corporation | $ 114,689,417 | $ 96,039,584 | $ 213,144,560 | $ 190,913,629 | ||
| Less: Dividends and undistributed earnings allocated to participating securities | 1,879,597 | 1,412,231 | 3,439,528 | 3,473,779 | ||
| Net Income available to common shareholders | $ 112,809,820 | $ 94,627,353 | $ 209,705,032 | $ 187,439,850 | ||
| Basic weighted average shares outstanding (in shares) | 208,580,380 | 219,631,876 | 209,720,391 | 221,376,755 | ||
| Net Income per share - Basic (in dollars per share) | [1] | $ 0.54 | $ 0.43 | $ 1.00 | $ 0.85 | |
| Diluted Earnings Per Share | ||||||
| Allocation of Net Income used in basic computation | $ 112,809,820 | $ 94,627,353 | $ 209,705,032 | $ 187,439,850 | ||
| Reallocation of undistributed earnings | 37 | 0 | 45 | 77 | ||
| Net Income available to common shareholders - Diluted | $ 112,809,857 | $ 94,627,353 | $ 209,705,077 | $ 187,439,927 | ||
| Number of shares used in basic computation (in shares) | 208,580,380 | 219,631,876 | 209,720,391 | 221,376,755 | ||
| Additional weighted average dilutive common stock equivalents (in shares) | 5,346 | 0 | 3,652 | 8,845 | ||
| Diluted weighted average shares outstanding (in shares) | 208,585,726 | 219,631,876 | 209,724,043 | 221,385,600 | ||
| Net Income per share - Diluted (in dollars per share) | [1] | $ 0.54 | $ 0.43 | $ 1.00 | $ 0.85 | |
| Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive (in shares) | 2,453,462 | 3,694,254 | 2,560,291 | 3,386,076 | ||
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) from continuing operations available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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