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Property and Equipment, Net of Depreciation, Depletion, and Amortization - Narrative (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 07, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Nov. 01, 2019 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) $ / bbl | Jun. 30, 2020 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  | $ 600,000 | $ 1,500,000
Asset retirement obligation liabilities incurred |  |  |  |  |  |  | 0 | 40,698
Impairment of proved property |  | $ 15,200,000 | $ 9,600,000 |  | $ 15,200,000 | $ 9,600,000 | $ 24,792,079 | $ 0
Natural Gas and Natural Gas Liquids |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Net price per barrel (in dollars per barrel) | $ / bbl |  |  |  |  |  |  | 19.81 |
Barnett Shale |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Non-operating working interest, percent | 17.00% |  |  |  |  |  |  |
Revenue interest, percent | 14.00% |  |  |  |  |  |  |
Purchase price of oil and gas assets | $ 18,300,000 |  |  |  |  |  |  |
Asset retirement obligation liabilities incurred | $ 2,800,000 |  |  |  |  |  |  |
Hamilton Dome Field |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Non-operating working interest, percent |  |  |  | 23.50% |  |  |  |
Revenue interest, percent |  |  |  | 19.70% |  |  |  |
Purchase price of oil and gas assets |  |  |  | $ 9,300,000 |  |  |  |
Asset retirement obligation liabilities incurred |  |  |  | $ 900,000 |  |  |  |

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- Definition Cost per unit of oil and gas production. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (2) + Details
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