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Asset Retirement Obligations (Details) - USD ($)
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset retirement obligations — beginning of period $ 1,422,955    
Liabilities incurred 31,268 $ 44,700  
Accretion of discount 48,962 90,290  
Revision of previous estimates 0 (778)  
Asset retirement obligations — end of period 1,503,185 $ 1,288,743  
Less current portion in accrued liabilities (35,539)   $ (35,539)
Long-term portion of asset retirement obligations $ 1,467,646   $ 1,387,416