Note 5 - Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

Schedule of Change in Asset Retirement Obligation [Table Text Block]

Balances, December 31, 2018	$	310,137
Liabilities settled		(7,740	)
Accretion of discount		14,086
Liabilities assumed through purchase		21,619
Liabilities incurred		426
Revisions of estimated liabilities		5,967
Balances, September 30, 2019		344,495
Less current portion		23,095
Long-term	$	321,400