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Note 6 - Goodwill and Acquisition-related Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]
   
December 31, 2018
  
   
Gross Amount
    
Accumulated Amortization
    
Net Amount
  
Know-how
   $
1,018
     $
(907
 )   $
111
  
Developed technologies
    
6,466
      
(6,466
 )    
-
  
Total
   $
7,484
     $
(7,373
 )   $
111
  
   
December 31, 2017
  
   
Gross Amount
    
Accumulated Amortization
    
Net Amount
  
Know-how
   $
1,018
     $
(704
 )   $
314
  
Developed technologies
    
6,466
      
(5,829
 )    
637
  
Total
   $
7,484
     $
(6,533
 )   $
951