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Note 4 - Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2018
   
2017
   
2018
   
2017
 
Numerator:
                               
Numerator for basic and diluted earnings per share – Net income available to common shareholders
  $
29,389
    $
21,999
    $
50,428
    $
36,478
 
Denominator–
                               
Denominator for basic earnings per share – weighted average shares outstanding
   
39,399
     
39,641
     
39,567
     
39,493
 
Effect of dilutive securities– Employee stock options and restricted stock awards
   
1,291
     
1,198
     
1,400
     
1,244
 
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions
   
40,690
     
40,839
     
40,967
     
40,737
 
Basic earnings per common share
  $
.75
    $
.55
    $
1.27
    $
.92
 
Diluted earnings per common share and common share equivalents
  $
.72
    $
.54
    $
1.23
    $
.90
 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2018
   
2017
   
2018
   
2017
 
Weighted average anti-dilutive options
   
753
     
662
     
420
     
695