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Note 9 - Earnings Per 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
   $
6,883
     $
5,266
  
Denominator
  
 
 
 
  
 
 
 
Weighted average shares used to compute basic EPS
    
40,604
      
39,905
  
Dilutive effect of share-based awards
    
48
      
237
  
Weighted average shares used to compute diluted EPS
    
40,652
      
40,142
  
                 
Earnings per share
  
 
 
 
  
 
 
 
Basic
   $
0.17
     $
0.13
  
Diluted
   $
0.17
     $
0.13