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Note 3 - Net Income Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
                 
   
Three Months Ended
  
   
March 31,
  
(in thousands, except share and per share amounts)
  
2019
    
2018
  
Net income
   $
15,511
     $
18,051
  
                 
Basic - weighted-average shares outstanding:
    
26,963,366
      
26,879,388
  
Effect of dilutive securities:
                
Employee stock options and other
    
213,673
      
317,711
  
Diluted - weighted-average shares outstanding:
    
27,177,039
      
27,197,099
  
Net income per share:
                
Basic
   $
0.58
     $
0.67
  
Diluted
   $
0.57
     $
0.66