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Note 4 - Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

Three Months Ended

June 30,

   

Six Months Ended

June 30,

 
   

2019

   

2018

   

2019

   

2018

 

Numerator:

                               

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

  $ 41,621     $ 29,389     $ 78,725     $ 50,428  

Denominator–

                               

Denominator for basic earnings per share – weighted average shares outstanding

    36,852       39,399       36,847       39,567  

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

    843       1,291       917       1,400  

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

    37,695       40,690       37,764       40,967  

Basic earnings per common share

  $ 1.13     $ .75     $ 2.14     $ 1.27  

Diluted earnings per common share and common share equivalents

  $ 1.10     $ .72     $ 2.08     $ 1.23  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

Three Months Ended

June 30,

   

Six Months Ended

June 30,

 
   

2019

   

2018

   

2019

   

2018

 

Weighted average anti-dilutive options

    1,397       753       1,186       420