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Note 3 - Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the three months ended
June 30,
   
For the six months ended
June 30,
 
   
2013
   
2012
   
2013
   
2012
 
   
(In thousands, except per share data)
 
Net income, as reported
  $ 9,627     $ 8,637     $ 16,383     $ 15,766  
Divided by:
                               
Weighted average common shares outstanding
    30,213       30,472       30,330       30,434  
Weighted average common stock equivalents
    22       20       27       22  
Total weighted average common shares outstanding and common stock equivalents
    30,235       30,492       30,357       30,456  
                                 
Basic earnings per common share
  $ 0.32     $ 0.28     $ 0.54     $ 0.52  
Diluted earnings per common share (1)
  $ 0.32     $ 0.28     $ 0.54     $ 0.52  
Dividend payout ratio
    40.6 %     46.4 %     48.1 %     50.0 %