CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($)	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 36,043,295	$ 33,101,657
Cost of products sold	(27,755,136)	(26,681,211)
Gross margin	8,288,159	6,420,446
Selling and administrative expenses	(6,051,958)	(5,459,582)
Operating profit	2,236,201	960,864
Interest expense	(21,024)	(36,285)
Other income	19,653	21,374
Income before income taxes	2,234,830	945,953
Income taxes	717,689	297,880
Net income	$ 1,517,141	$ 648,073
Earnings per share:
Basic (in dollars per share)	$ 0.24	$ 0.10
Diluted (in dollars per share)	0.24	0.10
Cash dividends per share: (in dollars per share)	$ 0.11	$ 0.11