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Note 4 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
  
 
  
March 31,
 
 
  
2016
    
2015
  
 
  
(Dollars in thousands, except per share amounts)
  
Numerator
 
 
 
 
 
 
 
 
Net income
 
$
9,563
 
 
$
8,420
 
Less: distributed earnings allocated to participating securities
 
 
(40
)
 
 
(25
)
Less: undistributed earnings allocated to participating securities
 
 
-
 
 
 
-
 
Net income attributable to common stockholders (numerator for basic earnings per share)
 
 
9,523
 
 
 
8,395
 
Add back: undistributed earnings allocated to participating securities
 
 
-
 
 
 
-
 
Less: undistributed earnings reallocated to participating securities
 
 
-
 
 
 
-
 
Numerator for diluted earnings per share under two class method
 
$
9,523
 
 
$
8,395
 
 
 
 
 
 
 
 
 
 
Denominator
 
 
 
 
 
 
 
 
Weighted-average common shares outstanding
 
 
48,827,971
 
 
 
48,714,637
 
Add: dilutive effect of stock options
 
 
5,473
 
 
 
176,877
 
Denominator for diluted earnings per share under two class method
 
 
48,833,444
 
 
 
48,891,514
 
 
 
 
 
 
 
 
 
 
Basic Earnings Per Common Share
 
$
0.20
 
 
$
0.17
 
Diluted Earnings Per Common Share
 
$
0.20
 
 
$
0.17