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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jul. 01, 2019
USD ($)
Accounting Policies [Abstract]      
Allowance for doubtful accounts $ 0 $ 0  
Revenue Recognition - Oil and Gas      
Receivables from oil and gas sales $ 3,200,000 3,900,000  
Oil and natural gas properties      
Limitation on Capitalized Costs      
Period considered for computing unweighted arithmetic average of oil and natural gas prices (in months) 12 months    
Other Property and Equipment | Minimum      
Other Property and Equipment      
Expected lives of the individual assets or group of assets 3 years    
Other Property and Equipment | Maximum      
Other Property and Equipment      
Expected lives of the individual assets or group of assets 7 years    
Discount rate | Oil and natural gas properties      
Limitation on Capitalized Costs      
Discount rate for present value (as a percent) 0.10    
ASU 2014-09      
Revenue Recognition - Oil and Gas      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 507,685  
ASU 2016-02      
Revenue Recognition - Oil and Gas      
ROU asset     $ 165,000
Forecast | ASU 2016-02      
Summary of Significant Accounting Policies      
Operating Lease, Liability     $ 165,000