Summary of Quarterly Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 29, 2012	Oct. 06, 2012	Jul. 14, 2012	Mar. 24, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 09, 2011	Mar. 19, 2011	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Net sales	$ 40,789	$ 34,206	$ 42,029	$ 30,565	$ 36,668	$ 28,734	$ 40,850	$ 27,998	$ 147,589	$ 134,250	$ 120,656
Operating income (loss)	2,371	(10,387)	2,689	2,742	242	(855)	2,717	2,067	(2,585)	4,171	8,189
Net Income (Loss)	$ 3,910	$ (11,503)	$ 1,087	$ 1,576	$ 2,133	$ (380)	$ 1,485	$ 1,203	$ (4,930)	$ 4,441	$ 6,059
Basic earnings (loss) per share (in dollars per share)	$ 0.29	$ (0.86)	$ 0.08	$ 0.12	$ 0.17	$ (0.03)	$ 0.12	$ 0.09	$ (0.37)	$ 0.35	$ 0.48