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Note 8 - Acquired Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Table Text Block]
        December 31, 2017   December 31, 2016    
    Gross Value   Accumulated
Currency
Translation
Adjustment		   Accumulated
Amortization		   Net Book
Value		   Accumulated
Currency
Translation
Adjustment		   Accumulated
Amortization		   Net Book
Value		   Useful
Life
Developed technology   $
17,100
     $
(2,550
 )   $
(7,723
 )   $
6,827
     $
(3,442
 )   $
(6,816
 )   $
6,842
      
15
  
In-process research & development    
4,406
      
(1,015
 )    
 
      
3,391
      
(1,433
 )    
-
      
2,973
      
Indefinite
  
Distributor relationships    
4,700
      
(415
 )    
(4,285
 )    
-
      
(415
 )    
(4,285
 )    
-
      
5
  
Patents    
1,000
      
(152
 )    
(431
 )    
417
      
(207
 )    
(381
 )    
412
      
16
  
Elevess trade name    
1,000
      
-
      
(1,000
 )    
-
      
-
      
(1,000
 )    
-
      
9
  
Total   $
28,206
     $
(4,132
 )   $
(13,439
 )   $
10,635
     $
(5,497
 )   $
(12,482
 )   $
10,227