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Note 15 - Basic and Diluted Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Year ended December 31,
  
   
2018
    
2017
    
2016
  
Numerator:
  
 
 
 
  
 
 
 
  
 
 
 
                         
Net income (loss)
   $
(1,957
 )   $
(3,003
 )   $
4,813
  
                         
Denominator:
  
 
 
 
  
 
 
 
  
 
 
 
                         
Weighted average number of shares of common stock outstanding during the year used to compute basic net earnings (loss) per share (in thousands)
    
22,512
      
22,229
      
21,800
  
Incremental shares attributable to exercise of outstanding options, SARs and RSUs (assuming proceeds would be used to purchase treasury stock) (in thousands)
    
-
      
-
      
1,087
  
                         
Weighted average number of shares of common stock used to compute diluted net earnings (loss) per share (in thousands)
    
22,512
      
22,229
      
22,887
  
                         
Basic net earnings (loss) per share
   $
(0.09
 )   $
(0.14
 )   $
0.22
  
                         
Diluted net earnings (loss) per share
   $
(0.09
 )   $
(0.14
 )   $
0.21