Unaudited Condensed Consolidated Statements of Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
NET SALES	$ 454,981,440	$ 443,139,073	$ 920,401,545	$ 896,674,323
COST OF GOODS SOLD	282,176,968	275,931,278	574,968,672	553,665,743
Gross profit	172,804,472	167,207,795	345,432,873	343,008,580
OPERATING EXPENSES:
Engineering, research and development	27,200,465	25,243,410	53,249,723	50,395,667
Selling, general & administrative	18,921,003	16,099,871	36,984,813	32,321,279
Total operating expenses	46,121,468	41,343,281	90,234,536	82,716,946
Income from operations	126,683,004	125,864,514	255,198,337	260,291,634
OTHER INCOME (LOSS)
Investment income	2,844,133	1,736,138	4,881,738	3,208,665
Other income (loss), net	(554,359)	343,111	652,634	(691,632)
Total Other Income	2,289,774	2,079,249	5,534,372	2,517,033
Income before provision for income taxes	128,972,778	127,943,763	260,732,709	262,808,667
PROVISION FOR INCOME TAXES	19,948,796	39,407,816	40,459,984	76,715,979
NET INCOME	$ 109,023,982	$ 88,535,947	$ 220,272,725	$ 186,092,688
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.40	$ 0.31	$ 0.81	$ 0.65
Diluted (in dollars per share)	0.40	0.31	0.80	0.64
Cash Dividends Declared per Share (in dollars per share)	$ 0.11	$ 0.10	$ 0.22	$ 0.19