Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Consolidated Statements of Income [Abstract]
Net sales	$ 251,742,619	$ 234,275,463
Cost of products sold	(189,890,070)	(175,550,418)
Gross margin	61,852,549	58,725,045
Product development expenses	(6,024,567)	(6,950,969)
Selling and administrative expenses	(35,719,188)	(33,914,735)
Restructuring costs	(2,650,940)	0
Operating profit	17,457,854	17,859,341
Interest expense	(1,857,961)	(1,202,272)
Other income	606,078	933,260
Income before income taxes	16,205,971	17,590,329
Income taxes	2,939,829	3,084,392
Net income	$ 13,266,142	$ 14,505,937
Earnings per Share:
Basic (in dollars per share)	$ 2.13	$ 2.32
Diluted (in dollars per share)	$ 2.12	$ 2.31