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Note 6 - Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(In thousands, except per share amounts)
 
20
16
 
  
2015
    
2014
  
Numerator:
                        
Net income
 
$
33,464
 
   $
35,745
     $
29,834
  
Denominator:
                        
Basic earnings per common share -
weighted-average shares
 
 
32,506
 
    
33,477
      
33,381
  
Effect of dilutive stock options
 
 
171
 
    
238
      
297
  
Diluted earnings per common share -
weighted-average shares
and assumed conversions
 
 
32,677
 
    
33,715
      
33,678
  
Basic earnings per common share
 
$
1.03
 
   $
1.07
     $
0.89
  
Diluted earnings per common share
 
$
1.02
 
   $
1.06
     $
0.89