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Note 4 - Earnings Per 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,
 
   
2019
   
2018
 
Numerator:
               
Numerator for basic and diluted earnings per share – Net income available to common shareholders
  $
37,104
    $
21,039
 
Denominator:
               
Denominator for basic earnings per share – weighted average shares outstanding
   
36,817
     
39,665
 
Effect of dilutive securities– Employee and director stock options and restricted share awards
   
1,017
     
1,427
 
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions
   
37,834
     
41,092
 
Basic earnings per common share
  $
1.01
    $
.53
 
Diluted earnings per common share and common share equivalents
  $
0.98
    $
0.51
 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
March 31, 2019
   
March 31, 2018
 
Anti-dilutive options
   
974
     
87