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Asset Retirement Obligations (Tables)
9 Months Ended
Mar. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of reconciliations of the beginning and ending asset retirement obligation balances
The following is a reconciliation of the beginning and ending asset retirement obligations for the nine months ended March 31, 2019 and for the year ended June 30, 2018:
 
March 31,
2019
 
June 30,
2018
Asset retirement obligations — beginning of period
$
1,422,955

 
$
1,288,743

Liabilities incurred
31,268

 
44,700

Accretion of discount
75,373

 
90,290

Revision of previous estimates
53,731

 
(778
)
Asset retirement obligations — end of period
$
1,583,327

 
$
1,422,955

Less current portion in accrued liabilities
(50,244
)
 
(35,539
)
Long-term portion of asset retirement obligations
$
1,533,083

 
$
1,387,416