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Stock-Based Compensation Plans (Narrative) (Details)
1 Months Ended 3 Months Ended
Jun. 30, 2022
shares
May 31, 2022
shares
Mar. 31, 2023
USD ($)
plan
shares
Mar. 31, 2022
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense for share-based payments | $     $ 8,519,535 $ 6,788,337
Employee Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued under the omnibus plan(in share)     1,624,122  
Number of shares authorized(in share) 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)     8,991,744  
Shares issued under the omnibus plan(in share)     22,671,217  
Number of shares authorized(in share)     45,000,000  
Employee Stock Option Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost | $     $ 8,754,103  
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 | $     $ 45,419,558  
Restricted period, maximum     10 years  
Amortization expense | $     $ 5,946,054 $ 5,290,805
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(in share)     156,103  
Number of shares authorized(in share)   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  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost | $     $ 19,418,307  
Performance Shares | Omnibus Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued under the omnibus plan(in share)     3,497,349