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Note 6 - Acquired Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Table Text Block]
        December 31, 2019   December 31, 2018    
    Gross
Value		   Accumulated
Currency
Translation
Adjustment		   Impairment   Accumulated
Amortization		   Net Book
Value		   Accumulated
Currency
Translation
Adjustment		   Accumulated
Amortization		   Net Book
Value		   Useful
Life
Developed technology   $
17,100
     $
(2,934
 )   $
(389
 )   $
(9,657
 )   $
4,120
     $
(2,824
 )   $
(8,672
 )   $
5,604
    
15
In-process research & development    
4,406
      
(1,234
 )    
–
      
–
      
3,172
      
(1,168
 )    
–
      
3,238
    
Indefinite
Distributor relationships    
4,700
      
(415
 )    
–
      
(4,285
 )    
–
      
(415
 )    
(4,285
 )    
–
    
5
Patents    
1,000
      
(176
 )    
–
      
(531
 )    
293
      
(169
 )    
(482
 )    
349
    
16
Elevess trade name    
1,000
      
–
      
–
      
(1,000
 )    
–
      
–
      
(1,000
 )    
–
    
9
Total   $
28,206
     $
(4,759
 )   $
(389
 )   $
(15,473
 )   $
7,585
     $
(4,576
 )   $
(14,439
 )   $
9,191