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Note 12 - Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 28, 2014
Dec. 29, 2013
Balance, beginning of year (in shares) 755,617 798,171 764,034
Balance, beginning of year (in shares) 616,792 585,769 649,412
Balance, beginning of year (in shares) 276,635 263,424 437,797
Balance, beginning of year (in dollars per share) $ 6.09 $ 5.97 $ 5.84
Authorized (in shares) 2,250,000    
Forfeited/cancelled/expired (in shares) (6,000) (25,211) (53,377)
Forfeited/cancelled/expired (in shares) 6,000 24,211 53,377
Forfeited/cancelled/expired (in dollars per share) $ 9.19 $ 5.19 $ 6.25
Exercised (in shares) (25,088) (28,343) (140,236)
Exercised (in dollars per share) $ 9.62 $ 4.73 $ 5.52
Granted (in shares) 1,695,000 11,000 227,750
Granted (in shares) (1,695,000) (11,000) (227,750)
Granted (in dollars per share) $ 9.07 $ 9.18 $ 6.18
Balance, end of year (in shares) 2,419,529 755,617 798,171
Balance, end of year (in shares) 724,529 616,792 585,769
Balance, end of year (in shares) 837,635 276,635 263,424
Balance, end of year (in dollars per share) $ 8.16 $ 6.09 $ 5.97