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Note 11 - Stock Incentive Plans - Summary of Stock Option Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
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
Granted, number of shares (in shares) 213,156 71,517 104,064
Granted, weighted average exercise price (in dollars per share) $ 13.68 $ 20.58 $ 9.59
Exercised, number of shares (in shares) 30,223 150,409 351,856
Exercised, weighted average exercise price (in dollars per share) $ 5.91 $ 6.07 $ 6.64
Forfeited, number of shares (in shares) 19,003 96,019
Forfeited, weighted average exercise price (in dollars per share) $ 12.15 $ 21.54
Canceled or expired, number of shares (in shares) 41,705 6,750
Canceled or expired, weighted average exercise price (in dollars per share) $ 32.95 $ 8.78
Outstanding, number of shares (in shares) 757,784 574,851 714,451
Outstanding, weighted average exercise price (in dollars per share) $ 9.91 $ 8.30 $ 8.14
Granted, number of shares (in shares) 213,156 71,517 104,064
Granted, weighted average exercise price (in dollars per share) $ 13.68 $ 20.58 $ 9.59
Exercised, number of shares (in shares) 30,223 150,409 351,856
Exercised, weighted average exercise price (in dollars per share) $ 5.91 $ 6.07 $ 6.64
Forfeited, number of shares (in shares) 19,003 96,019
Forfeited, weighted average exercise price (in dollars per share) $ 12.15 $ 21.54
Canceled or expired, number of shares (in shares) 41,705 6,750
Canceled or expired, weighted average exercise price (in dollars per share) $ 32.95 $ 8.78
Outstanding, weighted average remaining contractual term (Year) 6 years 182 days    
Outstanding, aggregate intrinsic value $ 3,369    
Exercisable, number of shares (in shares) 427,527    
Exercisable, weighted average exercise price (in dollars per share) $ 7.32    
Exercisable, weighted average remaining contractual term (Year) 5 years    
Exercisable, aggregate intrinsic value $ 2,902