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Note 5 - Intangible Assets
9 Months Ended
Sep. 30, 2018
Notes to Financial Statements  
Intangible Assets Disclosure [Text Block]
5.
Intangible Assets
 
Intangible assets as of
September 30, 2018
and
December 31, 2017
consisted of the following:
 
 
 
Estimated useful
lives (years)
 
 
September 30
,
2018
 
 
December 31,
2017
 
Tradename
 
 5
to
7
 
 
$
555
 
 
$
555
 
Patents and technological know-how
 
 
10
 
 
 
 
12,244
 
 
 
8,578
 
Proprietary software
 
 3
to
15
 
 
 
2,981
 
 
 
2,981
 
Other
 
 3
to
5
 
 
 
323
 
 
 
323
 
Total intangible assets
 
 
 
 
 
 
 
16,103
 
 
 
12,437
 
Accumulated amortization
 
 
 
 
 
 
 
(6,685
)
 
 
(5,894
)
Total intangible assets, net
 
 
 
 
 
 
$
9,418
 
 
$
6,543
 
 
The amortization of intangible assets for the
three
and
nine
months ended
September 30, 2018
and
2017
was as follows:
 
   
Three months ended
September 30
,
   
Nine months
ended
September 30
,
 
   
2018
   
2017
   
2018
   
2017
 
Amortization of intangible assets
  $
(279
)
  $
(231
)
  $
(791
)
  $
(699
)
 
The estimated future amortization expense of intangible assets is as follows:
 
Years ending December 31,
 
Amount
 
2018 (Remainder)
  $
291
 
2019
   
1,110
 
2020
   
932
 
2021
   
932
 
2022
   
932
 
Thereafter
   
5,221
 
Total
   
9,418