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Note D - Marketable Securities and Time Deposits (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Available-for-sale Securities [Table Text Block]
   
Amortized cost
    
Unrealized losses, net
    
Fair value
  
   
September
30,
2018
    
December 31,
2017
    
September
30,
2018
    
December 31,
2017
    
September
30,
2018
    
December 31,
2017
  
   
(Unaudited)
    
(Audited)
    
(Unaudited)
    
(Audited)
    
(Unaudited)
    
(Audited)
  
                                                 
Short-term deposits
    
7,394
     $
5,481
     $
-
     $
-
     $
7,394
     $
5,481
  
Long-term deposits
    
5,100
      
5,013
      
-
      
-
      
5,100
      
5,013
  
U.S. GSE securities
    
21,759
      
22,359
      
(454
 )    
(315
 )    
21,305
      
22,044
  
Corporate obligations
    
75,525
      
75,722
      
(1,516
 )    
(894
 )    
74,009
      
74,828
  
                                                 
    $
109,778
     $
108,575
     $
(1,970
 )   $
(1,209
 )   $
107,808
     $
107,366
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
 
 
 
  
Unrealized gains (losses)
    
 
 
 
   
Amortized
cost
    
Gains
    
Losses
    
Fair value
  
                                 
Due in one year or less
   $
34,489
     $
1
     $
(80
 )   $
34,410
  
Due after one year to five years
    
75,289
      
1
      
(1,892
 )    
73,398
  
                                 
    $
109,778
     $
2
     $
(1,972
 )   $
107,808