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Note 10 - Net Loss Per Share of Common Stock (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Nine months ended

September 30,
    
Three months ended

September 30,
  
   
2019
(unaudited)
    
2018
(unaudited)
    
2019
(unaudited)
    
2018
(unaudited)
  
Numerator:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net income (loss)
   $
(3,034
 )   $
(1,729
 )   $
775
     $
2,543
  
Denominator (in thousands):
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic weighted-average common stock outstanding
    
21,936
      
22,091
      
21,953
      
21,997
  
Effect of stock -based awards
    
—
      
—
      
451
      
431
  
Diluted weighted average common stock outstanding
    
21,936
      
22,091
      
22,404
      
22,428
  
                                 
Basic net income (loss) per share
   $
(0.14
 )   $
(0.08
 )   $
0.04
     $
0.12
  
Diluted net income (loss) per share
   $
(0.14
 )   $
(0.08
 )   $
0.03
     $
0.11