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Note 13 - Net Income Per Common Share (Tables)
12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   

2014

   

2013

   

2012

 

(dollars and shares in thousands, except per share data)

                       

Basic:

                       

Net income available to common shareholders

  $ 53,644     $ 46,441     $ 34,723  

Average common shares outstanding

    26,684       25,726       23,136  

Basic net income per common share

  $ 2.01     $ 1.81     $ 1.50  
                         

Diluted:

                       

Net income available to common shareholders

  $ 53,644     $ 46,441     $ 34,723  

Average common shares outstanding

    26,684       25,726       23,136  

Adjustment for common share equivalents

    867       633       608  

Average common shares outstanding-diluted

    27,551       26,359       23,744  

Diluted net income per common share

  $ 1.95     $ 1.76     $ 1.46  
                         

Anti-dilutive shares

    13,000       35,079       131,182