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Note 3 - Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months
  
   
Ended March 31,
  
(In thousands, except per share amounts)
  
2019
    
2018
  
Numerator:
                
Net income
   $
13,546
     $
10,331
  
Denominator:
                
Basic earnings per common share - weighted-average shares
    
54,553
      
54,572
  
Effect of dilutive stock options
    
493
      
523
  
Diluted earnings per common share - weighted-average shares and assumed conversions
    
55,046
      
55,095
  
                 
Basic earnings per common share
   $
0.25
     $
0.19
  
Diluted earnings per common share
   $
0.25
     $
0.19