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Note 4 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
  
   
March 31,
  
   
2018
    
2017
  
   
(Dollars in thousands, except per share amounts)
  
Numerator
  
 
 
 
  
 
 
 
Net income
   $
38,764
     $
22,249
  
Less: distributed earnings allocated to participating securities
    
(105
 )    
(68
 )
Less: undistributed earnings allocated to participating securities
    
(124
 )    
(43
 )
Net income attributable to common stockholders (numerator for basic earnings per share)
    
38,535
      
22,138
  
Add back: undistributed earnings allocated to participating securities
    
124
      
43
  
Less: undistributed earnings reallocated to participating securities
    
(122
 )    
(43
 )
Numerator for diluted earnings per share under two class method
   $
38,537
     $
22,138
  
                 
Denominator
  
 
 
 
  
 
 
 
Weighted-average common shares outstanding
    
55,871,087
      
55,448,161
  
Add: dilutive effect of stock options
    
1,024,805
      
269,057
  
Denominator for diluted earnings per share under two class method
    
56,895,892
      
55,717,218
  
                 
Basic Earnings Per Common Share
   $
0.69
     $
0.40
  
Diluted Earnings Per Common Share
   $
0.68
     $
0.40