Selected Quarterly Financial Information (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Selected Quarterly Financial Information (Unaudited) [Abstract]
Net sales	$ 35,809,652	$ 39,644,050	$ 41,559,589	$ 40,495,894	$ 38,057,309	$ 36,089,946	$ 35,520,182	$ 33,188,612	$ 157,509,185	$ 142,856,049	$ 130,130,360
Gross margin	7,757,129	8,165,493	9,245,390	8,184,466	7,546,735	6,556,418	6,932,112	6,316,341	33,352,478	27,351,606	26,672,223
Selling and administrative expenses	4,853,876	4,830,971	5,101,156	5,015,052	4,979,633	4,429,312	4,633,196	4,597,285	19,801,055	18,639,426	18,160,504
Net (loss)/income	$ 1,723,871	$ 2,223,975	$ 2,632,346	$ 2,045,608	$ 1,464,016	$ 1,459,941	$ 1,482,799	$ 1,098,174	$ 8,625,800	$ 5,504,930	$ 5,543,005
Net (loss)/income per share [Abstract]
Basic (in dollars per share)	$ 0.28	$ 0.36	$ 0.42	$ 0.33	$ 0.24	$ 0.24	$ 0.24	$ 0.18	$ 1.39	$ 0.89	$ 0.91
Diluted (in dollars per share)	$ 0.28	$ 0.36	$ 0.42	$ 0.33	$ 0.24	$ 0.24	$ 0.24	$ 0.18	$ 1.38	$ 0.89	$ 0.90
Weighted average shares outstanding [Abstract]
Basic (in shares)	6,219,384	6,219,241	6,217,198	6,213,913	6,212,875	6,172,193	6,166,883	6,162,711	6,216,931	6,178,664	6,104,711
Diluted (in shares)	6,237,709	6,234,727	6,231,335	6,231,739	6,230,722	6,202,496	6,218,492	6,213,069	6,233,375	6,216,193	6,192,019