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Note 8 - Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
(In thousands, except per share amounts)
  
201
8
    
2017
    
2016
  
Numerator:
                        
Net income
  
$
55,027
     $
90,284
     $
33,464
  
Denominator:
                        
Basic earnings per common share - weighted-average shares
  
 
54,590
      
54,492
      
54,177
  
Effect of dilutive stock options
  
 
559
      
358
      
284
  
Diluted earnings per common share - weighted-average shares and assumed conversions
  
 
55,149
      
54,850
      
54,461
  
Basic earnings per common share
  
$
1.01
     $
1.66
     $
0.62
  
Diluted earnings per common share
  
$
1.00
     $
1.65
     $
0.61