5. Patents and Licenses (Tables)

3 Months Ended

Mar. 31, 2019

Patents And Licenses Tables Abstract

Patents and Licenses

March 31, 2019						December 31, 2018
Weighted Average Original Life (years)		Gross Carrying Amount		Accumulated Amortization		Weighted Average Original Life (years)		Gross Carrying Amount		Accumulated Amortization
	15.67	$	13,840	$	12,211		15.67	$	13,840	$	12,181

Future Amortization Expense

2020	$	119
2021	$	119
2022	$	117
2023	$	113
2024	$	113