CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)	3 Months Ended			9 Months Ended
	Sep. 27, 2014		Sep. 28, 2013	Sep. 27, 2014		Sep. 28, 2013
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) [Abstract]
Net sales	$ 35,803,405		$ 34,256,086	$ 106,432,304		$ 108,196,240
Cost of products sold	(27,161,932)		(27,031,677)	(82,501,121)		(86,174,409)
Gross margin	8,641,473		7,224,409	23,931,183		22,021,831
Selling and administrative expenses	(4,892,600)		(4,767,505)	(15,097,253)		(14,671,986)
Operating profit	3,748,873		2,456,904	8,833,930		7,349,845
Interest expense	(60,680)		(78,629)	(193,875)		(249,481)
Other income	14,030		8,201	37,996		36,660
Income before income taxes	3,702,223		2,386,476	8,678,051		7,137,024
Income taxes	1,270,406		587,693	3,049,846		2,158,699
Net income	$ 2,431,817		$ 1,798,783	$ 5,628,205		$ 4,978,325
Earnings per share:
Basic (in dollars per share)	$ 0.39		$ 0.29	$ 0.90		$ 0.80
Diluted (in dollars per share)	$ 0.39		$ 0.29	$ 0.90		$ 0.80
Cash dividends per share: (in dollars per share)	$ 0.15	[1]	$ 0.11	$ 0.37	[1]	$ 0.31

[1] The Company paid an additional one-time dividend of $0.04 per share in the third quarter of 2014.