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Note 3 - Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    For the three months ended   For the nine months ended
    September 30,   September 30,
    2017   2016   2017   2016
    (In thousands, except per share data)
Net income, as reported   $
10,179
    $
10,634
    $
35,164
    $
50,630
 
Divided by:                                
Weighted average common shares outstanding    
29,120
     
28,861
     
29,092
     
28,993
 
Weighted average common stock equivalents    
1
     
14
     
2
     
13
 
Total weighted average common shares outstanding and common stock equivalents    
29,121
     
28,875
     
29,094
     
29,006
 
                                 
Basic earnings per common share   $
0.35
    $
0.37
    $
1.21
    $
1.75
 
Diluted earnings per common share
(1)
  $
0.35
    $
0.37
    $
1.21
    $
1.75
 
Dividend payout ratio    
51.4
%    
45.9
%    
44.6
%    
29.1
%