CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 34,692,174	$ 40,495,894
Cost of products sold	(28,425,594)	(32,311,428)
Gross margin	6,266,580	8,184,466
Selling and administrative expenses	(4,681,296)	(5,015,052)
Operating profit	1,585,284	3,169,414
Interest expense	(86,076)	(89,237)
Other income	8,588	6,136
Income before income taxes	1,507,796	3,086,313
Income taxes	502,548	1,040,705
Net income	$ 1,005,248	$ 2,045,608
Earnings per share:
Basic (in dollars per share)	$ 0.16	$ 0.33
Diluted (in dollars per share)	$ 0.16	$ 0.33
Cash dividends per share (in dollars per share)	$ 0.10	$ 0.10