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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

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