CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 34,779,773	$ 39,247,980	$ 70,628,899	$ 73,940,154
Cost of products sold	(27,003,469)	(30,717,138)	(55,339,189)	(59,142,732)
Gross margin	7,776,304	8,530,842	15,289,710	14,797,422
Selling and administrative expenses	(4,988,364)	(5,223,185)	(10,204,653)	(9,904,481)
Operating profit	2,787,940	3,307,657	5,085,057	4,892,941
Interest expense	(64,626)	(84,776)	(133,195)	(170,852)
Other income	16,683	19,871	23,966	28,459
Income before income taxes	2,739,997	3,242,752	4,975,828	4,750,548
Income taxes	1,046,494	1,068,458	1,779,440	1,571,006
Net income	$ 1,693,503	$ 2,174,294	$ 3,196,388	$ 3,179,542
Earnings per share:
Basic (in dollars per share)	$ 0.27	$ 0.35	$ 0.51	$ 0.51
Diluted (in dollars per share)	$ 0.27	$ 0.35	$ 0.51	$ 0.51
Cash dividends per share: (in dollars per share)	$ 0.11	$ 0.10	$ 0.22	$ 0.20