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Note 14 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2016
    
2015
    
2014
  
   
(in thousands)
  
Basic weighted-average shares outstanding
   $
18,989
     $
19,335
     $
19,608
  
Effect of potential exercise of stock options
, RSUs, and performance shares
    
427
      
328
      
389
  
Diluted weighted-average shares outstanding
   $
19,416
     $
19,663
     $
19,997