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Note 3 - Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    For the three months ended   For the six months ended
    June 30,   June 30,
    2017   2016   2017   2016
    (In thousands, except per share data)
Net income, as reported   $
12,725
     $
30,435
     $
24,985
     $
39,996
  
Divided by:                                
Weighted average common shares outstanding    
29,135
      
29,022
      
29,077
      
29,059
  
Weighted average common stock equivalents    
1
      
12
      
3
      
14
  
Total weighted average common shares outstanding and common stock equivalents    
29,136
      
29,034
      
29,080
      
29,073
  
                                 
Basic earnings per common share   $
0.44
     $
1.05
     $
0.86
     $
1.38
  
Diluted earnings per common share
(1)
   $
0.44
     $
1.05
     $
0.86
     $
1.38
  
Dividend payout ratio    
40.9
 %    
16.2
 %    
41.9
 %    
24.6
 %