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Note 4 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year Ended December 31,
 
 
  
2016
    
2015
    
2014
  
 
  
(Dollars in thousands, except per share amounts)
  
Numerator
 
 
 
 
 
 
 
 
 
 
 
 
Net income
 
$
103,211
 
 
$
65,791
 
 
$
63,143
 
Less: distributed earnings allocated to participating securities
 
 
(163
)
 
 
(98
)
 
 
(196
)
Less: undistributed earnings allocated to participating securities
 
 
(179
)
 
 
(37
)
 
 
(60
)
Net income attributable to common stockholders (numerator for basic earnings per share)
 
 
102,869
 
 
 
65,656
 
 
 
62,887
 
Add back: undistributed earnings allocated to participating securities
 
 
179
 
 
 
37
 
 
 
60
 
Less: undistributed earnings reallocated to participating securities
 
 
(179
)
 
 
(37
)
 
 
(60
)
Numerator for diluted earnings per share under two class method
 
$
102,869
 
 
$
65,656
 
 
$
62,887
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding
 
 
51,286,942
 
 
 
51,202,616
 
 
 
51,046,318
 
Add: dilutive effect of stock options
 
 
160,205
 
 
 
212,964
 
 
 
212,126
 
Denominator for diluted earnings per share under two class method
 
 
51,447,147
 
 
 
51,415,580
 
 
 
51,258,444
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic Earnings Per Common Share
 
$
2.01
 
 
$
1.28
 
 
$
1.23
 
Diluted Earnings Per Common Share
 
$
2.00
 
 
$
1.28
 
 
$
1.23