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Note 9 - Intangible Assets
 6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Goodwill and Intangible Assets Disclosure [Text Block]
9.
Intangible Assets
 
Intangible assets as of
June 30, 2018
and
December 31, 2017
consisted of the following:
 
        June 30, 2018   December 31, 2017    
    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
     $
(2,704
 )   $
(8,210
 )   $
6,186
     $
(2,550
 )   $
(7,723
 )   $
6,827
    
15
In-process research & development    
4,406
      
(1,097
 )    
-
      
3,309
      
(1,015
 )    
-
      
3,391
    
Indefinite
Distributor relationships    
4,700
      
(415
 )    
(4,285
 )    
-
      
(415
 )    
(4,285
 )    
-
    
5
Patents    
1,000
      
(162
 )    
(457
 )    
381
      
(152
 )    
(431
 )    
417
    
16
Elevess trade name    
1,000
      
-
      
(1,000
 )    
-
      
-
      
(1,000
 )    
-
    
9
Total   $
28,206
     $
(4,378
 )   $
(13,952
 )   $
9,876
     $
(4,132
 )   $
(13,439
 )   $
10,635
    
 
 
The aggregate amortization expense related to intangible assets was
$0.3
million and
$0.2
million for the
three
-month periods ended
June 30, 2018
and
2017,
respectively. The aggregate amortization expense related to intangible assets was
$0.5
million for each of the
six
-month periods ended
June 30, 2018
and
2017.