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5. Patents and Licenses (Tables)
 6 Months Ended
Jun. 30, 2017
Patents And Licenses Tables  
Patents and Licenses
June 30, 2017  December 31, 2016
Weighted Average Original Life (years)  Gross Carrying Amount  Accumulated Amortization  Weighted Average Original Life (years)  Gross Carrying Amount  Accumulated Amortization
 15.67   $13,840   $12,003    15.67   $13,840   $11,911 
Future Amortization Expense
 2018 $119 
 2019 $119 
 2020 $119 
 2021 $119 
 2022 $117