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STOCK-BASED COMPENSATION PLANS - Narrative (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2022 shares | Dec. 31, 2024 USD ($) plan shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Jun. 30, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award expiration period |  | 2 years 4 months 24 days | 2 years 10 months 24 days | 3 years 1 month 6 days |
Granted (in shares) |  | 1,189,000 | 1,027,000 | 949,000 |
Omnibus Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares approved (in shares) |  | 45,000,000 |  |  |
Shares issued under plan (in shares) |  | 30,663,754 |  |  |
Awards granted net of shares from canceled/expired options (in shares) |  | 5,044,379 |  |  |
Maximum restricted period |  | 10 years |  |  |
Granted (in shares) |  | 5,290,546 |  |  |
Shares outstanding (in shares) |  | 3,174,624 |  |  |
Employee Stock Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares approved (in shares) |  | 24,000,000 |  |  |
Awards granted net of shares from canceled/expired options (in shares) |  | 12,674,639 |  |  |
Unrecognized compensation cost | $ |  | $ 5,022,501 |  |  |
Weighted-average period for unrecognized compensation cost expected to be recognized |  | 1 year 3 months 25 days |  |  |
Employee Stock Option Plan | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  | 1 year |  |  |
Award expiration period |  | 5 years |  |  |
Employee Stock Option Plan | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  | 5 years |  |  |
Award expiration period |  | 10 years |  |  |
Restricted Stock Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares approved (in shares) |  | 9,000,000 |  |  |
Unrecognized compensation cost | $ |  | $ 53,315,524 |  |  |
Granted (in shares) |  | 5,630,019 |  |  |
Restricted compensation expense | $ |  | $ 25,819,690 | $ 24,809,834 | $ 21,773,179 |
Stock Compensation Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of plans | plan |  | 2 |  |  |
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of plans | plan |  | 2 |  |  |
Stock option expense | $ |  | $ 5,070,620 | 6,095,854 | 6,302,581 |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost | $ |  | 11,767,729 |  |  |
Stock option expense | $ |  | $ 5,884,030 | 5,882,458 | 1,246,369 |
Performance Share Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  | 4 years |  |  |
Stock option expense | $ |  | $ 1,800,429 | 1,526,983 |  |
Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of plans | plan |  | 2 |  |  |
Shares approved (in shares) |  |  |  |  | 2,000,000
Employee Stock Purchase Plan | Gentex Corporation Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares approved (in shares) | 2,000,000 |  |  |  |
Stock option expense | $ |  | $ 964,594 | $ 882,294 | $ 906,478 |
ESPP discount rate | 85.00% |  |  |  |
Discount recognized as compensation expense | 15.00% |  |  |  |

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