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Note 11 - Summary of the Balance and Activity for the Plans Related to Stock Options (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Outstanding, Number of Shares (in shares) 714,451 1,065,012 1,155,239
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 8.14 $ 8.72 $ 8.53
Granted, Number of Shares (in shares) 71,517 104,064 195,512
Granted, Weighted Average Exercise Price (in dollars per share) $ 20.58 $ 9.59 $ 6.56
Exercised, Number of Shares (in shares) 150,409 351,856 204,658
Exercised, Weighted Average Exercise Price (in dollars per share) $ 6.07 $ 6.64 $ 5.60
Forfeited, Number of Shares (in shares) 19,003 96,019 39,931
Forfeited, Weighted Average Exercise Price (in dollars per share) $ 12.15 $ 21.54 $ 8.20
Canceled or expired, Number of Shares (in shares) 41,705 6,750 41,150
Canceled or expired, Weighted Average Exercise Price (in dollars per share) $ 32.95 $ 8.78 $ 9.10
Outstanding, Number of Shares (in shares) 574,851 714,451 1,065,012
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 8.30 $ 8.14 $ 8.72
Outstanding, Weighted Average Remaining Contractual Term 6 years 146 days    
Outstanding, Aggregate Intrinsic Value $ 2,826    
Exercisable, Number of Shares (in shares) 365,596    
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 6.36    
Exercisale, Weighted Average Remaining Contractual Term 5 years 109 days    
Exercisable, Aggregate Intrinsic Value $ 2,151