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Note C - Net Earnings (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three months ended
September
30,
    
Nine
months ended
September
30,
  
   
2018
    
2017
    
2018
    
2017
  
   
Unaudited
  
Net income (loss)
   $
405
     $
578
     $
(1,637
 )   $
(2,874
 )
Loss per share:
                                
Basic
   $
0.02
     $
0.03
     $
(0.07
 )   $
(0.13
 )
Diluted
   $
0.02
     $
0.02
     $
(0.07
 )   $
(0.13
 )
Weighted average number of shares of common stock outstanding during the period used to compute basic net earnings (loss) per share (in thousands)
    
22,449
      
22,276
      
22,603
      
22,186
  
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)
    
889
      
967
      
-
      
-
  
Weighted average number of shares of common stock used to compute diluted net earnings (loss) per share (in thousands)
    
23,338
      
23,243
      
22,603
      
22,186