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Note 3 - Marketable Securities and Time Deposits (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Available-for-sale Securities [Table Text Block]
   
Amortized cost
    
Unrealized gains
(losses), net
   
Fair value
  
   
201
9
    
2018
    
201
9
    
2018
    
201
9
    
2018
  
                                                 
Short-term deposit
   $
15,067
     $
8,349
     $
-
     $
-
     $
15,067
     $
8,349
  
Long-term deposit
    
-
      
5,130
      
-
      
-
      
-
      
5,130
  
U.S. GSE securities
    
4,468
      
21,550
      
(6
 )    
(253
 )    
4,462
      
21,297
  
Corporate obligations
    
82,556
      
77,857
      
(60
 )    
(1,382
 )    
82,496
      
76,475
  
                                                 
    $
102,091
     $
112,885
     $
(66
 )   $
(1,635
 )   $
102,025
     $
111,251
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Amortized
    
Unrealized gains (losses)
    
Fair
  
   
cost
    
Gains
    
Losses
    
value
  
                                 
Due in one year or less
   $
24,033
     $
55
     $
(14
 )   $
24,074
  
Due after one year to five years
    
62,991
      
124
      
(231
 )    
62,884
  
                                 
    $
87,024
     $
179
     $
(245
 )   $
86,958
  
   
Amortized
    
Unrealized gains (losses)
    
Fair
  
   
cost
    
Gains
    
Losses
    
value
  
                                 
Due in one year or less
   $
27,442
     $
-
     $
(78
 )   $
27,364
  
Due after one year to six years
    
71,965
      
1
      
(1,558
 )    
70,408
  
                                 
    $
99,406
     $
1
     $
(1,636
 )   $
97,772