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Note 13 - Net Income Per Share (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended September 30,
   
Nine Months Ended September 30,
 
   
2019
   
2018
   
2019
   
2018
 
                                 
Net income
  $
10,747
    $
27,801
    $
15,886
    $
20,164
 
                                 
Basic weighted-average common shares outstanding
   
9,745
     
9,735
     
9,739
     
9,723
 
Effect of potentially dilutive common shares
(1)
   
40
     
-
     
23
     
9
 
Diluted weighted-average common shares outstanding
   
9,785
     
9,735
     
9,762
     
9,732
 
                                 
Net income per common share:
                               
Basic
  $
1.10
    $
2.86
    $
1.63
    $
2.07
 
Diluted
  $
1.10
    $
2.86
    $
1.63
    $
2.07