Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Activity in stock option plan
Shares Available for Grant, Beginning Balance	741,978	505,221	760,137
Shares Available for Grant, Additional shares reserved	52,128	391,166	163,378
Shares Available for Grant, Options granted	(149,600)	(335,050)	(319,900)
Shares Available for Grant, Restricted stock granted	(234,012)	(66,665)	(100,315)
Shares Available for Grant, Options exercised
Shares Available for Grant, Options cancelled	123,679	356,277	72,274
Shares Available for Grant, Options expired	(57,628)	(108,971)	(70,353)
Shares Available for Grant, Ending Balance	476,545	741,978	505,221
Outstanding, Number of Shares, Beginning Balance	1,570,543	1,766,401	1,618,066
Number of Shares, Additional shares reserved
Number of Shares, Options granted	149,600	335,050	319,900
Number of Shares, Options exercised	(493,622)	(174,631)	(99,291)
Number of Shares, Options cancelled	(123,679)	(356,277)	(72,274)
Number of Shares, Options expired
Number of Shares, Ending Balance	1,102,842	1,570,543	1,766,401
Aggregate Price, Beginning Balance	$ 5,698	$ 6,380	$ 5,906
Aggregate Price, Additional shares reserved
Aggregate Price, Options granted	851	1,313	1,148
Aggregate Price, Options exercised	(1,495)	(445)	(321)
Aggregate Price, Options cancelled	(698)	(1,550)	(353)
Aggregate Price, Options expired
Aggregate Price, Ending Balance	$ 4,356	$ 5,698	$ 6,380
Weighted Average Exercise Price, Beginning Balance	$ 3.63	$ 3.61	$ 3.65
Weighted Average Exercise Price, Additional shares reserved
Weighted Average Exercise Price, Options granted	$ 5.69	$ 3.92	$ 3.59
Weighted Average Exercise Price, Options exercised	$ 3.03	$ 2.55	$ 3.24
Weighted Average Exercise Price, Options cancelled	$ 5.64	$ 4.35	$ 4.88
Weighted Average Exercise Price, Options expired
Weighted Average Exercise Price, Ending Balance	$ 3.97	$ 3.63	$ 3.61