CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 39,247,980	$ 41,559,589	$ 73,940,154	$ 82,055,483
Cost of products sold	(30,717,138)	(32,314,199)	(59,142,732)	(64,625,627)
Gross margin	8,530,842	9,245,390	14,797,422	17,429,856
Selling and administrative expenses	(5,223,185)	(5,101,156)	(9,904,481)	(10,116,208)
Operating profit	3,307,657	4,144,234	4,892,941	7,313,648
Interest expense	(84,776)	(98,667)	(170,852)	(187,904)
Other income	19,871	4,587	28,459	10,723
Income before income taxes	3,242,752	4,050,154	4,750,548	7,136,467
Income taxes	1,068,458	1,417,808	1,571,006	2,458,513
Net income	$ 2,174,294	$ 2,632,346	$ 3,179,542	$ 4,677,954
Earnings per share:
Basic (in dollars per share)	$ 0.35	$ 0.42	$ 0.51	$ 0.75
Diluted (in dollars per share)	$ 0.35	$ 0.42	$ 0.51	$ 0.75
Cash dividends per share (in dollars per share)	$ 0.10	$ 0.10	$ 0.20	$ 0.20