Consolidated Statements of Income (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Consolidated Statements of Income [Abstract]
Net sales	$ 157,509,185	$ 142,856,049	$ 130,130,360
Cost of products sold	(124,156,707)	(115,504,443)	(103,458,137)
Gross margin	33,352,478	27,351,606	26,672,223
Selling and administrative expenses	(19,801,055)	(18,639,426)	(18,160,504)
Operating profit	13,551,423	8,712,180	8,511,719
Interest expense	(369,357)	(231,481)	(266,297)
Other income	42,452	26,230	2,996
Income before income taxes	13,224,518	8,506,929	8,248,418
Income taxes	4,598,718	3,001,999	2,705,413
Net income	$ 8,625,800	$ 5,504,930	$ 5,543,005
Earnings per Share:
Basic (in dollars per share)	$ 1.39	$ 0.89	$ 0.91
Diluted (in dollars per share)	$ 1.38	$ 0.89	$ 0.90