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Note 7 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
March 31
,
  
   
2017
    
201
6
  
Net Income
   $
10,177
     $
9,891
  
                 
Weighted-average number of basic shares outstanding during the period
    
18,972
      
18,994
  
Dilutive effect of stock options, RSUs, and
PSAs
    
451
      
279
  
Weighted-average number of diluted shares outstanding during the period
    
19,423
      
19,273
  
                 
Basic earnings per share
   $
0.54
     $
0.52
  
Diluted earnings per share
   $
0.52
     $
0.51