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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Activity in stock option plan      
Shares Available for Grant, Beginning Balance 505,221 760,137 862,157
Outstanding, Number of Shares, Beginning Balance 1,766,401 1,618,066 1,583,508
Aggregate Price, Beginning Balance $ 6,380 $ 5,906 $ 6,169
Weighted Average Exercise Price, Beginning Balance $ 3.61 $ 3.65 $ 3.91
Shares Available for Grant, Additional shares reserved 324,501 63,063 93,299
Shares Available for Grant, Options granted (335,050) (319,900) (195,800)
Number of Shares, Options granted 335,050 319,900 195,800
Aggregate Price, Options Granted 1,313 1,148 780
Weighted Average Exercise Price, Options granted $ 3.92 $ 3.59 $ 3.98
Number of shares, Options exercised (174,631) (99,291) (34,558)
Shares Available for Grant, Options exercised 0 0 0
Aggregate Price, Options Exercised (445) (321) (88)
Weighted Average Exercise Price, Options exercised $ 2.55 $ 3.24 $ 2.54
Shares Available for Grant, Options cancelled 356,277 72,274 126,684
Number of Shares, Options cancelled (356,277) (72,274) (126,684)
Aggregate Price, Options cancelled (1,550) (353) (955)
Weighted Average Exercise Price, Options cancelled $ 4.35 $ 4.88 $ 7.54
Shares Available for Grant, Options expired (108,971) (70,353) (126,203)
Number of Shares, Options expired 0 0 0
Aggregate Price, Options expired 0 0 0
Weighted Average Exercise Price, Options expired $ 0.00 $ 0.00 $ 0.00
Shares Available for Grant, Ending Balance 741,978 505,221 760,137
Number of Shares, Ending Balance 1,570,543 1,766,401 1,618,066
Aggregate Price, Ending Balance $ 5,698 $ 6,380 $ 5,906
Weighted Average Exercise Price, Ending Balance $ 3.63 $ 3.61 $ 3.65