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Note 3 - Marketable Securities and Time Deposits (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Available-for-sale Securities [Table Text Block]
   
Amortized cost
    
Unrealized gains
(losses), net
   
Fair value
  
   
201
8
    
201
7
    
201
8
    
201
7
    
201
8
    
201
7
  
                                                 
Short-term deposit
   $
8,349
     $
5,481
     $
-
     $
-
     $
8,349
     $
5,481
  
Long-term deposit
    
5,130
      
5,013
      
-
      
-
      
5,130
      
5,013
  
U.S. GSE securities
    
21,550
      
22,359
      
(253
 )    
(315
 )    
21,297
      
22,044
  
Corporate obligations
    
77,857
      
75,722
      
(1,382
 )    
(894
 )    
76,475
      
74,828
  
                                                 
    $
112,885
     $
108,575
     $
(1,635
 )   $
(1,209
 )   $
111,251
     $
107,366
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
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 five years
    
71,965
      
1
      
(1,558
 )    
70,408
  
                                 
    $
99,406
     $
1
     $
(1,636
 )   $
97,772
  
   
Amortized
    
Unrealized gains (losses)
    
Fair
  
   
cost
    
Gains
    
Losses
    
value
  
                                 
Due in one year or less
   $
19,239
     $
3
     $
(26
 )   $
19,216
  
Due after one year to six years
    
78,842
      
10
      
(1,196
 )    
77,656
  
                                 
    $
98,081
     $
13
     $
(1,222
 )   $
96,872