3. Patents and Licenses (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Information Regarding Patents and Licenses
December 31, 2015     December 31, 2014  
Weighted Average Original Life (years)     Gross Carrying Amount     Accumulated Amortization     Weighted Average Original Life (years)     Gross Carrying Amount     Accumulated Amortization  
  15.67     $ 13,840     $ 11,647       15.67     $ 13,840     $ 11,302  
Estimated Future Amortization Expense
2016   $ 251  
2017   $ 155  
2018   $ 123  
2019   $ 123  
2020   $ 119