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Note 6 - Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
Goodwill and Intangible Assets Disclosure [Text Block]
6
.
Goodwill and Intangible Assets
 
M
anagement evaluates goodwill for impairment on an annual basis (
fourth
quarter), and
no
impairment charge was identified for the years presented.
 
Definite-lived i
ntangible assets, consisting of patents and trademarks, are amortized over their useful lives. Intangible assets consisted of the following:
 
   
December 31, 2017
   
December 31, 2016
 
                                                 
   
Weighted
Average
Amortization
Period (Years)
   
Gross
Carrying
Amount
   
Accumulated
Amortization
   
Net
Carrying
Amount
   
Weighted
Average
Amortization
Period (Years)
   
Gross
Carrying
Amount
   
Accumulated
Amortization
   
Net
Carrying
Amount
 
Patents and Trademarks
   
4.0
    $
474,000
    $
(453,000
)   $
21,000
     
4.0
    $
474,000
    $
(440,000
)   $
34,000
 
 
Amortization
expense for intangible assets was
$13,000
and
$17,000
for the years ended
December 31, 2017
and
2016,
respectively.
 
Estimated future amortization expense related to
definite-lived intangible assets is as follows:
  
 
Years ending December 31,
 
 
 
 
         
2018
  $
5,000
 
2019
   
3,000
 
2020
   
3,000
 
2021
   
2,000
 
2022
   
2,000
 
Thereafter
   
6,000
 
    $
21,000