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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income from consolidated operations $ 100,886,704 $ 122,549,041 $ 291,411,199 $ 316,820,194
Other comprehensive income (loss) before tax:        
Foreign currency translation adjustments 872,761 1,776,813 2,636,542 317,059
Unrealized gains (losses) on derivatives 147,094 0 (1,098,273) 0
Unrealized (losses) gains on debt securities, net (301,948) 4,193,565 2,524,319 4,245,746
Other comprehensive income, before tax 717,907 5,970,378 4,062,588 4,562,805
Income tax impact related to components of other comprehensive income (loss) (32,519) 880,649 299,470 891,607
Other comprehensive income, net of tax 750,426 5,089,729 3,763,118 3,671,198
Comprehensive income from consolidated operations 101,637,130 127,638,770 295,174,317 320,491,392
Net loss attributable to non-controlling interests (81,206) 0 (470,340) 0
Comprehensive income attributable to Gentex Corporation $ 101,718,336 $ 127,638,770 $ 295,644,657 $ 320,491,392