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Note 4 - Fair Value Measurement (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Description
 
December 31,
201
8
   
Level I
   
Level II
   
Level III
 
Assets:
                               
Marketable securities:
                               
Certificate of deposits
  $
747
     
    $
747
     
 
Government bonds
   
496
     
     
496
     
 
Corporate bonds
   
76,226
     
     
76,226
     
 
Investment in other company (1)
   
936
     
     
     
936
 
                                 
Liabilities:
                               
Foreign exchange contracts
   
77
     
     
77
     
 
Description
 
December 31,
201
7
   
Level I
   
Level II
   
Level III
 
Assets:
                               
Marketable securities:
                               
Certificate of deposits
  $
747
     
    $
747
     
 
Government bonds
   
495
     
     
495
     
 
Corporate bonds
   
81,422
     
     
81,422