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Note 11 - Stock Incentive Plans - Activity for Stock Options (Details) - USD ($)
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Outstanding (in shares) 757,784 574,851 714,451
Outstanding, weighted average exercise price (in dollars per share) $ 9.91 $ 8.30 $ 8.14
Granted (in shares) 72,051 213,156 71,517
Granted, weighted average exercise price (in dollars per share) $ 8.85 $ 13.68 $ 20.58
Exercised (in shares) (1,269) (30,223) (150,409)
Exercised, weighted average exercise price (in dollars per share) $ 6.36 $ 5.91 $ 6.07
Forfeited (in shares) (26,795) (19,003)
Forfeited, weighted average exercise price (in dollars per share) $ 13.45 $ 12.15
Canceled or expired (in shares) (10,204) (41,705)
Canceled or expired, weighted average exercise price (in dollars per share) $ 12.51 $ 32.95
Outstanding (in shares) 791,567 757,784 574,851
Outstanding, weighted average exercise price (in dollars per share) $ 9.67 $ 9.91 $ 8.30
Outstanding, weighted average remaining contractual term (Year) 5 years 292 days    
Outstanding, aggregate intrinsic value $ 1,228    
Options exercisable (in shares) 569,361    
Options exercisable, weighted average exercise price (in dollars per share) $ 8.46    
Options exercisable, weighted average remaining contractual term (Year) 4 years 292 days    
Options exercisable, , aggregate intrinsic value $ 1,203