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Note 7 - Fair Value Measurement (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Description
  
September 30
,
2019 (unaudited)
    
Level I
(unaudited)
    
Level II
(unaudited)
    
Level III
(unaudited)
  
Assets:
                                
Marketable securities:
                                
Government bonds
   $
500
     $
—
     $
500
     $
—
  
Corporate bonds
    
69,962
      
—
      
69,962
      
—
  
Foreign exchange contracts
    
20
      
—
      
20
      
—
  
Description
  
December 31, 2018
    
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
      
—