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Note E - Marketable Securities and Time Deposits (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Available-for-sale Securities [Table Text Block]
   
Amortized cost
    
Unrealized losses, net
   
Fair value
  
   
June 30,
201
9
    
December 31,
2018
    
June 30,
201
9
    
December 31,
2018
    
June 30,
201
9
    
December 31,
2018
  
   
(Unaudited)
    
(Audited)
    
(Unaudited)
    
(Audited)
    
(Unaudited)
    
(Audited)
  
                                                 
Short-term deposits
    
5,467
     $
8,349
     $
-
      
-
      
5,467
     $
8,349
  
Long-term deposits
    
5,188
      
5,130
      
-
      
-
      
5,188
      
5,130
  
U.S. GSE securities
    
17,158
      
21,550
      
(41
 )    
(253
 )    
17,117
      
21,297
  
Corporate obligations
    
80,031
      
77,857
      
(201
 )    
(1,382
 )    
79,830
      
76,475
  
                                                 
    $
107,844
     $
112,885
     $
(242
 )   $
(1,635
 )   $
107,602
     $
111,251
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
 
 
 
  
Unrealized gains (losses)
    
 
 
 
   
Amortized
cost
    
Gains
    
Losses
    
Fair value
  
                                 
Due in one year or less
   $
30,188
     $
49
     $
(15
 )   $
30,222
  
Due after one year to five years
    
77,656
      
127
      
(403
 )    
77,380
  
                                 
    $
107,844
     $
176
     $
(418
 )   $
107,602