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Stock-Based Compensation Plans (Narrative) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2022
shares
May 31, 2022
shares
Sep. 30, 2022
USD ($)
plan
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
plan
shares
Sep. 30, 2021
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense for share-based payments | $     $ 7,611,545 $ 7,492,763 $ 22,973,113 $ 20,114,921
Employee Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued under the Omnibus plan         1,624,122  
Number of shares authorized 2,000,000          
ESPP discount rate 85.00%          
ESPP discount rate recognized as compensation expense 15.00%          
Omnibus Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Total grants in period (in shares)         7,994,761  
Shares issued under the Omnibus plan         19,523,865  
Number of shares authorized     45,000,000   45,000,000  
Employee Stock Option Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost | $     $ 9,723,678   $ 9,723,678  
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]            
Unrecognized compensation cost | $     45,827,137   $ 45,827,137  
Restricted period, maximum         10 years  
Amortization expense | $     $ (5,504,462) $ (5,215,981) $ (16,130,339) $ (13,978,358)
Gentex Corporation Employee Stock Purchase Plan | Employee Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued under the Omnibus plan         54,977  
Number of shares authorized   2,000,000        
ESPP discount rate   85.00%        
ESPP discount rate recognized as compensation expense   15.00%        
Equity Incentive Plans            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of plans | plan     2   2  
Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost | $     $ 8,480,588   $ 8,480,588  
Performance Shares | Omnibus Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued under the Omnibus plan         2,271,456