Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Consolidated Statements of Income [Abstract]
Net sales	$ 204,239,613	$ 137,608,258	$ 144,567,951
Cost of products sold	(154,188,794)	(101,262,048)	(110,318,320)
Gross margin	50,050,819	36,346,210	34,249,631
Engineering expenses	(5,622,829)	(2,568,307)	(2,459,062)
Selling and administrative expenses	(32,151,289)	(22,642,031)	(23,762,841)
Operating profit	12,276,701	11,135,872	8,027,728
Interest expense	(976,512)	(121,500)	(185,475)
Other income	154,753	209,043	178,722
Income before income taxes	11,454,942	11,223,415	8,020,975
Income taxes	6,409,687	3,438,092	2,293,932
Net income	$ 5,045,255	$ 7,785,323	$ 5,727,043
Earnings per Share:
Basic (in dollars per share)	$ 0.81	$ 1.25	$ 0.92
Diluted (in dollars per share)	$ 0.80	$ 1.25	$ 0.92