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Other Intangible Assets, Other than Goodwill
12 Months Ended
Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets Disclosure [Text Block]
Note 8.
Other Intangible Assets, Other than Goodwill
 
 
 
December 31, 2016
 
 
 
Gross 
carrying 
amount
 
Weighted 
average 
amortization
period
 
Accumulated
amortization
 
 
 
 
 
 
(in thousands)
 
 
 
 
Amortized intangible assets:
 
 
 
 
 
 
 
 
 
Technology
 
$
6,889
 
7 years
 
 
3,771
 
Patents
 
 
100
 
15 years
 
 
48
 
Total
 
$
6,989
 
 
 
 
3,819
 
 
 
 
December 31, 2017
 
 
 
Gross 
carrying 
amount
 
Weighted
average
amortization
period
 
Accumulated 
amortization
 
 
 
 
 
 
(in thousands)
 
 
 
 
Amortized intangible assets:
 
 
 
 
 
 
 
 
 
Technology
 
$
6,889
 
7 years
 
 
4,756
 
Patents
 
 
100
 
15 years
 
 
54
 
Total
 
$
6,989
 
 
 
 
4,810
 
 
Amortization expense for the years ended December 31, 2015, 2016 and 2017 was $852 thousand, $991 thousand and $991 thousand, respectively. Estimated amortization expense for the next five years is $991 thousand in 2018, $603 thousand in 2019, $214 thousand in 2020 and 2021, and $145 thousand in 2022.