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Note 5 - Intangible Assets
 6 Months Ended
Jun. 30, 2018
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]
5.
Intangible Assets
 
Intangible assets as of
June 30, 2018
and
December 31, 2017
consisted of the following:
 
   
Estimated useful
lives (years)
    
June 30
,
2018
    
December 31,
2017
  
Tradename
  
5
to
7
     $
555
     $
555
  
Patents and technological know-how
  
10
to
17
      
11,059
      
8,578
  
Proprietary software
  
3
to
15
      
2,981
      
2,981
  
Other
  
3
to
5
      
323
      
323
  
Total intangible assets
  
 
 
 
      
14,918
      
12,437
  
Accumulated amortization
  
 
 
 
      
(6,407
)
    
(5,894
)
Total intangible assets, net
  
 
 
 
     $
8,511
     $
6,543
  
 
 
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(Unaudited - Dollars in thousands, except per share amounts)
 
The amortization of intangible assets for the
three
and
six
months ended
June 30, 2018
and
2017
was as follows:
 
   
Three months ended June 30,
    
Six months ended June 30,
  
   
2018
    
2017
    
2018
    
2017
  
Amortization of intangible assets
   $
(265
)
   $
(231
)
   $
(513
)
   $
(468
)
 
The estimated future amortization expense of intangible assets is as follows:
 
Years ending December 31,
  
Amount
  
2018 (Remainder)
   $
537
  
2019
    
1,010
  
2020
    
831
  
2021
    
831
  
2022
    
831
  
Thereafter
    
4,471
  
Total
   $
8,511