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Note 4 - Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

Three Months Ended

 
   

March 31,

2014

   

March 31,

2013

 

Numerator -

               

Numerator for basic and diluted earnings per share-

               

Net income available to common shareholders

  $ 12,014     $ 13,547  
                 

Denominator-

               

Denominator for basic earnings per share, weighted average shares outstanding

    39,332       39,119  

Effect of dilutive securities-

               

Employee and Director stock options and restricted stock awards

    1,179       1,150  

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

    40,511       40,269  
                 

Basic earnings per common share

  $ .31     $ .35  

Diluted earnings per common share and common share equivalents

  $ .30     $ .34  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

March 31,

2014

   

March 31,

2013

 

Anti-dilutive options

    431       1,107