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Note D - Marketable Securities and Time Deposits (Tables)
 6 Months Ended
Jun. 30, 2018
Notes Tables  
Available-for-sale Securities [Table Text Block]
   
Amortized cost
    
Unrealized losses, net
   
Fair value
  
   
June
3
0
,
201
8
    
December 31,
201
7
    
June
3
0
,
201
8
    
December 31,
201
7
    
June
3
0
,
201
8
    
December 31,
201
7
  
   
(Unaudited)
    
(Audited)
    
(Unaudited)
    
(Audited)
    
(Unaudited)
    
(Audited)
  
                                                 
Short-term deposits
    
5,342
     $
5,481
     $
-
     $
-
     $
5,342
     $
5,481
  
Long-term deposits
    
5,071
      
5,013
      
-
      
-
      
5,071
      
5,013
  
U.S. GSE securities
    
22,075
      
22,359
      
(489
 )    
(315
 )    
21,586
      
22,044
  
Corporate obligations
    
76,811
      
75,722
      
(1,506
 )    
(894
 )    
75,305
      
74,828
  
                                                 
    $
109,299
     $
108,575
     $
(1,995
 )   $
(1,209
 )   $
107,304
     $
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
   $
30,760
     $
1
     $
(77
 )   $
30,684
  
Due after one year to five years
    
78,539
      
1
      
(1,920
 )    
76,620
  
                                 
    $
109,299
     $
2
     $
(1,997
 )   $
107,304