Unaudited Condensed Consolidated Statements of Income - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
NET SALES		$ 468,711,354	$ 454,981,440	$ 937,300,351	$ 920,401,545
COST OF GOODS SOLD		292,173,750	282,176,968	591,118,243	574,968,672
Gross profit		176,537,604	172,804,472	346,182,108	345,432,873
OPERATING EXPENSES:
Engineering, research and development		28,359,343	27,200,465	56,448,524	53,249,723
Selling, general & administrative		20,273,295	18,921,003	40,232,286	36,984,813
Total operating expenses		48,632,638	46,121,468	96,680,810	90,234,536
Income from operations		127,904,966	126,683,004	249,501,298	255,198,337
OTHER INCOME (LOSS)
Investment income		2,140,387	2,844,133	5,403,128	4,881,738
Other income (loss), net		237,191	(554,359)	286,660	652,634
Total other income		2,377,578	2,289,774	5,689,788	5,534,372
INCOME BEFORE PROVISION FOR INCOME TAXES		130,282,544	128,972,778	255,191,086	260,732,709
PROVISION FOR INCOME TAXES		21,323,919	19,948,796	41,952,050	40,459,984
NET INCOME		$ 108,958,625	$ 109,023,982	$ 213,239,036	$ 220,272,725
EARNINGS PER SHARE:
Basic (in dollars per share)	[1]	$ 0.42	$ 0.40	$ 0.82	$ 0.81
Diluted (in dollars per share)	[1]	0.42	0.40	0.82	0.80
Cash Dividends Declared per Share (in dollars per share)		$ 0.115	$ 0.110	$ 0.230	$ 0.220

[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.