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Asset Retirement Obligations (Tables)
6 Months Ended
Dec. 31, 2018
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 six months ended December 31, 2018 and for the year ended June 30, 2018:
 
December 31,
2018
 
June 30,
2018
Asset retirement obligations — beginning of period
$
1,422,955

 
$
1,288,743

Liabilities incurred
31,268

 
44,700

Accretion of discount
48,962

 
90,290

Revision of previous estimates

 
(778
)
Asset retirement obligations — end of period
$
1,503,185

 
$
1,422,955

Less current portion in accrued liabilities
(35,539
)
 
(35,539
)
Long-term portion of asset retirement obligations
$
1,467,646

 
$
1,387,416