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Asset Retirement Obligations (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset retirement obligations — beginning of period $ 1,610,845    
Liabilities incurred 0 $ 31,268  
Accretion of discount 26,287 101,506  
Revision of previous estimates 0 55,116  
Asset retirement obligations — end of period 1,637,132 $ 1,422,955  
Less current portion in accrued liabilities (50,244)   $ (50,244)
Long-term portion of asset retirement obligations $ 1,586,888   $ 1,560,601