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Note 5 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

Three Months Ended

March 31,

 
   

2020

   

2019

 

Numerator:

               
Numerator for basic and diluted earnings per share –                

Net income available to common shareholders

  $ 23,107     $ 37,104  

Denominator:

               

Denominator for basic earnings per share – weighted average shares outstanding

    36,485       36,817  

Effect of dilutive securities–

               

Employee and director stock options and restricted share awards

    841       1,017  

Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions

    37,326       37,834  

Basic earnings per common share

  $ 0.63     $ 1.01  

Diluted earnings per common share and common share equivalents

  $ 0.62     $ 0.98  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

March 31,

2020

   

March 31,

2019

 

Weighted average anti-dilutive options

    1,194       974