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Note 4 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

Three Months Ended

March 31,

 
   

2022

   

2021

 

Numerator:

               

Numerator for basic and diluted earnings per share – Net income available to common shareholders

  $ 92,453     $ 45,333  

Denominator:

               

Denominator for basic earnings per share – weighted average shares outstanding

    55,938       55,567  

Effect of dilutive securities– Employee stock options and restricted share awards

    1,974       2,167  

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

    57,912       57,734  

Basic earnings per common share

  $ 1.65     $ 0.82  

Diluted earnings per common share and common share equivalents

  $ 1.60     $ 0.79  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

March 31,

2022

   

March 31,

2021

 

Anti-dilutive options – weighted average

    502       131