UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
NET SALES		$ 657,858,210	$ 572,925,778	$ 1,234,631,300	$ 1,163,150,989
COST OF GOODS SOLD		432,567,307	384,362,469	817,606,810	772,350,073
Gross profit		225,290,903	188,563,309	417,024,490	390,800,916
OPERATING EXPENSES:
Engineering, research and development		51,471,277	44,003,994	97,395,641	86,185,980
Selling, general & administrative		48,515,355	29,675,293	78,448,360	60,384,602
Severance expense		6,784,136	0	9,673,248	0
Total operating expenses		106,770,768	73,679,287	185,517,249	146,570,582
Income from operations		118,520,135	114,884,022	231,507,241	244,230,334
OTHER (LOSS) INCOME
Investment (loss) income, net		(3,628,231)	(12,393,771)	1,246,624	(15,762,295)
Other, net		578,235	(1,159,272)	(3,656,144)	510,867
Total other loss, net		(3,049,996)	(13,553,043)	(2,409,520)	(15,251,428)
INCOME BEFORE PROVISION FOR INCOME TAXES		115,470,139	101,330,979	229,097,721	228,978,906
PROVISION FOR INCOME TAXES		19,819,689	15,290,541	38,573,226	34,707,753
NET INCOME		95,650,450	86,040,438	190,524,495	194,271,153
Less: Net loss attributable to non-controlling interests		(389,134)	0	(389,134)	0
NET INCOME ATTRIBUTABLE TO GENTEX CORPORATION		$ 96,039,584	$ 86,040,438	$ 190,913,629	$ 194,271,153
EARNINGS PER SHARE ATTRIBUTABLE TO GENTEX CORPORATION:
Basic (in dollars per share)	[1]	$ 0.43	$ 0.37	$ 0.85	$ 0.84
Diluted (in dollars per share)	[1]	0.43	0.37	0.85	0.84
Cash Dividends Declared per Share (in dollars per share)		$ 0.12	$ 0.12	$ 0.24	$ 0.24

[1] (1) Earnings Per Share has been adjusted to exclude the portion of net income allocated to participating securities as a result of share-based payment awards.