Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2018

Asset Retirement Obligations [Abstract]

Asset Retirement Obligations

The estimated present value of this liability was $517,000 at December 31, 2017.

	2017
Asset retirement obligations, start of year	$	491,000
Accretion of liability		26,000
Asset retirement of obligations, end of the year	$	517,000