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