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

June
3
0
,
    
Three months ended

June
3
0
,
  
   
201
9
(unaudited)
    
201
8
(unaudited)
    
201
9
(unaudited)
    
201
8
(unaudited)
  
Numerator:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net loss
   $
(3,809
 )   $
(4,272
 )   $
(1,512
 )   $
(2,090
 )
Denominator (in thousands):
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic weighted-average common stock outstanding
    
21,927
      
22,139
      
21,936
      
22,129
  
Effect of stock -based awards
    
—
      
—
      
—
      
—
  
Diluted weighted average common stock outstanding
    
21,927
      
22,139
      
21,936
      
22,129
  
                                 
Basic net loss per share
   $
(0.17
 )   $
(0.19
 )   $
(0.07
 )   $
(0.09
 )
Diluted net loss per share
   $
(0.17
 )   $
(0.19
 )   $
(0.07
 )   $
(0.09
 )