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Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2014
   
2013
   
2012
 
   
(In thousands, except per share data)
 
Net income, as reported
  $ 44,239     $ 37,752     $ 34,331  
Divided by:
                       
Weighted average common shares outstanding
    29,788       30,047       30,402  
Weighted average common stock equivalents
    29       26       31  
Total weighted average common shares outstanding and common stock equivalents
    29,817       30,073       30,433  
                         
Basic earnings per common share
  $ 1.49     $ 1.26     $ 1.13  
Diluted earnings per common share
  $ 1.48     $ 1.26     $ 1.13  
Dividend Payout ratio
    40.3 %     41.3 %     46.0 %