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Note 7 - Stock Option Activity (Details) - $ / shares
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 29, 2015
Balance, beginning of year (in shares) 2,419,529 755,617 755,617
Balance, beginning of year (in shares) 724,529 616,792 616,792
Balance, beginning of year (in shares) 837,635 276,635 276,635
Balance, beginning of year (in dollars per share) $ 8.16 $ 6.09 $ 6.09
Authorized (in shares) 874,709    
Granted (in shares) 160,000    
Granted (in shares) (160,000)    
Granted (in dollars per share) $ 10.53    
Exercised (in shares) (159,626) (2,500) (2,500)
Exercised (in dollars per share) $ 10.24 $ 6.14  
Balance, end of year (in shares) 2,419,903 753,117  
Balance, end of year (in shares) 564,903 677,870  
Balance, end of year (in shares) 1,552,344 276,635  
Balance, end of year (in dollars per share) $ 8.49 $ 6.09