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Note 2 - Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months
   
Six Months
 
   
Ended June 30,
    
Ended June 30,
 
(In thousands, except per share amounts)
  
2017
    
2016
    
2017
    
2016
  
Numerator:
                                
Net income
   $
9,141
     $
8,531
     $
17,355
     $
16,724
  
Denominator:
                                
Basic earnings per common share - weighted-average shares
    
54,493
      
54,069
      
54,459
      
54,079
  
Effect of dilutive stock options
    
309
      
320
      
313
      
312
  
Diluted earnings per common share - weighted-average shares and assumed conversions
    
54,802
      
54,389
      
54,772
      
54,391
  
                                 
Basic earnings per common share
   $
0.17
     $
0.16
     $
0.32
     $
0.31
  
Diluted earnings per common share
   $
0.17
     $
0.16
     $
0.32
     $
0.31