Unaudited Condensed Consolidated Statements of Income - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
NET SALES		$ 477,761,417	$ 460,253,433	$ 1,415,061,768	$ 1,380,654,978
COST OF GOODS SOLD		297,440,131	287,263,147	888,558,373	862,231,819
Gross profit		180,321,286	172,990,286	526,503,395	518,423,159
OPERATING EXPENSES:
Engineering, research and development		29,398,725	26,888,999	85,847,249	80,138,722
Selling, general & administrative		22,786,881	18,673,376	63,019,167	55,658,189
Total operating expenses		52,185,606	45,562,375	148,866,416	135,796,911
Income from operations		128,135,680	127,427,911	377,636,979	382,626,248
OTHER INCOME (LOSS)
Investment income		3,353,510	3,180,683	8,756,638	8,062,421
Other income (loss), net		90,323	(73,979)	376,983	578,655
Total other income		3,443,833	3,106,704	9,133,621	8,641,076
INCOME BEFORE PROVISION FOR INCOME TAXES		131,579,513	130,534,615	386,770,600	391,267,324
PROVISION FOR INCOME TAXES		19,681,661	19,198,798	61,633,712	59,658,782
NET INCOME		$ 111,897,852	$ 111,335,817	$ 325,136,888	$ 331,608,542
EARNINGS PER SHARE:
Basic (in dollars per share)	[1]	$ 0.44	$ 0.42	$ 1.27	$ 1.23
Diluted (in dollars per share)	[1]	0.44	0.42	1.26	1.22
Cash Dividends Declared per Share (in dollars per share)		$ 0.115	$ 0.110	$ 0.345	$ 0.330

[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.