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Members’/Shareholders' Equity - Cash Distributions (Details) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
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Mar. 04, 2021 USD ($) $ / shares | Feb. 26, 2021 | Feb. 04, 2021 USD ($) | Sep. 30, 2021 USD ($) $ / shares | Jun. 30, 2021 USD ($) $ / shares | Mar. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares | Sep. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total Distribution | $ | $ 5.0 |  | $ 3.8 | $ 5.5 | $ 0.0 | $ 8.8 | $ 3.8 | $ 2.5 | $ 2.5 | $ 5.0 | $ 5.0 | $ 18.1 | $ 15.0
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (USD per Share/Unit) | $ / shares | $ 0.28 |  |  | $ 0.28 | $ 0 | $ 0.29 | $ 0.30 | $ 0.20 | $ 0.20 | $ 0.40 | $ 0.40 |  |
Reverse stock split |  |  |  |  |  |  |  |  |  |  |  | 0.083 |
Tengasco |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split |  | 0.083 |  |  |  |  |  |  |  |  |  |  |
Stock conversion ratio |  | 97.796467 |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770 + Details
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