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Asset Retirement Obligations (Details) - USD ($)
9 Months Ended 12 Months Ended
Mar. 31, 2019
Jun. 30, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
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