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Note C - Net Earnings (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended
June 30,
    
Six months ended
June 30,
  
   
2018
    
2017
    
2018
    
2017
  
   
Unaudited
  
Net loss
   $
(288
 )   $
(586
 )   $
(2,041
 )   $
(3,452
 )
Loss per share:
                                
Basic
   $
(0.01
 )   $
(0.03
 )   $
(0.09
 )   $
(0.16
 )
Diluted
   $
(0.01
 )   $
(0.03
 )   $
(0.09
 )   $
(0.16
 )
Weighted average number of shares of common stock outstanding during the period used to compute basic net earnings (loss) per share (in thousands)
    
22,681
      
22,180
      
22,680
      
22,141
  
Incremental shares attributable to exercise of outstanding options, stock appreciation rights and restricted stock units (assuming proceeds would be used to purchase treasury stock) (in thousands)
    
-
      
-
      
-
      
-
  
Weighted average number of shares of common stock used to compute diluted net earnings (loss) per share (in thousands)
    
22,681
      
22,180
      
22,680
      
22,141