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STOCK-BASED COMPENSATION PLANS - Narrative (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2022 shares | Dec. 31, 2023 USD ($) plan shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Jun. 30, 2022 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Option expiration period |  | 2 years 10 months 24 days | 3 years 1 month 6 days | 3 years 4 months 24 days |
Shares, granted (in shares) |  | 1,027,000 | 949,000 | 1,099,000 |
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) |  | 25,611,657 |  |  |
Options granted net of shares from canceled/expired options (in shares) |  | 4,908,950 |  |  |
Maximum restricted period |  | 10 years |  |  |
Shares, granted (in shares) |  | 4,231,194 |  |  |
Shares outstanding (in shares) |  | 3,377,863 |  |  |
Employee Stock Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares approved (in shares) |  | 24,000,000 |  |  |
Options granted net of shares from canceled/expired options (in shares) |  | 12,674,639 |  |  |
Unrecognized compensation cost | $ |  | $ 7,993,783 |  |  |
Weighted-average period for unrecognized compensation cost expected to be recognized |  | 2 years 1 month 2 days |  |  |
Employee Stock Option Plan | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Option vesting period |  | 1 year |  |  |
Option expiration period |  | 5 years |  |  |
Employee Stock Option Plan | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Option vesting period |  | 5 years |  |  |
Option 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 | $ |  | $ 45,797,227 |  |  |
Shares, granted (in shares) |  | 5,630,019 |  |  |
Restricted compensation expense | $ |  | $ 24,809,834 | $ 21,773,179 | $ 19,304,013 |
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 | $ |  | $ 6,095,854 | 6,302,581 | 5,780,959 |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost | $ |  | 16,118,617 |  |  |
Stock option expense | $ |  | $ 5,882,458 | 1,246,369 | 1,573,831 |
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 | $ |  | $ 882,294 | $ 906,478 | $ 713,912 |
ESPP discount rate | 85.00% |  |  |  |
Discount recognized as compensation expense | 15.00% |  |  |  |
Performance Share Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock option expense | $ |  | $ 1,526,983 |  |  |

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