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Note 8 - Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended June 30,
    
Six Months Ended June 30,
  
   
2019
    
2018
    
2019
    
2018
  
Net income used in the computation of basic and diluted net income per share (in thousands)
   $
2,781
     $
3,817
     $
5,157
     $
6,267
  
                                 
Weighted average shares outstanding - basic
    
14,952,802
      
14,956,221
      
14,940,072
      
14,888,940
  
Common stock equivalents
    
334,555
      
603,183
      
334,934
      
619,577
  
Weighted average shares outstanding - diluted
    
15,287,357
      
15,559,404
      
15,275,006
      
15,508,517
  
Per Share Data:
                                
Basic
                                
Net income
   $
0.19
     $
0.26
     $
0.35
     $
0.42
  
Diluted
                                
Net income
   $
0.18
     $
0.25
     $
0.34
     $
0.40