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Note 2 - Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three Months  
    Ended March 31,  
(In thousands, except per share amounts)
  
2017
    
2016
  
Numerator:
                
Net income
   $
8,214
     $
8,193
  
Denominator:
                
Basic earnings per common share -
weighted-average shares
    
32,655
      
32,454
  
Effect of dilutive stock options
    
188
      
185
  
Diluted earnings per common share -
weighted-average shares and
assumed conversions
    
32,843
      
32,639
  
                 
Basic earnings per common share
   $
0.25
     $
0.25
  
Diluted earnings per common share
   $
0.25
     $
0.25