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Note 2 - Earnings Per Common Share (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three
Months
   
Nine
Months
 
   
Ended September 30,
   
Ended
September 30,
 
(In thousands, except per share amounts)
 
2017
   
2016
   
2017
   
2016
 
Numerator:
                               
Net income
  $
7,855
    $
8,437
    $
25,210
    $
25,161
 
Denominator:
                               
Basic earnings per common share - weighted-average shares
   
54,517
     
54,218
     
54,479
     
54,126
 
Effect of d
ilutive stock options
   
373
     
308
     
324
     
296
 
Diluted earnings per common share - weighted-average shares and assumed conversions
   
54,890
     
54,526
     
54,803
     
54,422
 
                                 
Basic earnings per common share
  $
0.14
    $
0.16
    $
0.46
    $
0.46
 
Diluted earnings per common share
  $
0.14
    $
0.15
    $
0.46
    $
0.46