CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 57,357,442	$ 56,007,937	$ 177,663,291	$ 150,095,975
Cost of products sold	(43,139,780)	(44,058,406)	(133,670,797)	(113,888,301)
Gross margin	14,217,662	11,949,531	43,992,494	36,207,674
Product development expenses	(2,004,919)	(1,848,861)	(5,089,178)	(4,162,151)
Selling and administrative expenses	(7,472,335)	(6,527,029)	(25,602,515)	(23,749,219)
Operating profit	4,740,408	3,573,641	13,300,801	8,296,304
Interest expense	(310,507)	(327,206)	(918,897)	(659,884)
Other income	228,787	13,513	673,287	69,278
Income before income taxes	4,658,688	3,259,948	13,055,191	7,705,698
Income taxes	892,027	1,029,467	2,929,858	2,491,674
Net income	$ 3,766,661	$ 2,230,481	$ 10,125,333	$ 5,214,024
Earnings per Share:
Basic (in dollars per share)	$ 0.60	$ 0.36	$ 1.62	$ 0.83
Diluted (in dollars per share)	0.60	0.35	1.61	0.83
Cash dividends per share: (in dollars per share)	$ 0.11	$ 0.11	$ 0.33	$ 0.33