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Asset Retirement Obligations
 12 Months Ended
Jun. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
Our asset retirement obligations represent the estimated present value of the amount we will incur to plug, abandon and remediate our producing properties at the end of their productive lives in accordance with applicable laws. The following is a reconciliation of the beginning and ending asset retirement obligations for the years ended June 30, 2018 and 2017:
 
Years Ended
 
2018
 
2017
Asset retirement obligations — beginning of period
$
1,288,743

 
$
962,196

Liabilities incurred
44,700

 
52,792

Liabilities settled
—

 
(157,164
)
Liabilities sold
—

 
(47,817
)
Accretion of discount
90,290

 
59,664

Revisions to previous estimates
(778
)
 
419,072

Asset retirement obligations — end of period
1,422,955

 
1,288,743

Less: current asset retirement obligations
(35,539
)
 
(35,115
)
Long-term portion of asset retirement obligations
$
1,387,416

 
$
1,253,628