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Members’/Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 02, 2021 USD ($) $ / shares shares | Mar. 04, 2021 USD ($) | Feb. 26, 2021 shares | Feb. 04, 2021 USD ($) | Sep. 30, 2021 USD ($) shares | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) shares | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in Shares) | shares | 1,666,667 |  |  |  | 19,672,050 |  |  |  | 0 |  |  |  | 19,672,050 | 0
Proceeds from issuance of common stock | $ | $ 46,700 |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 | $ 0
Cash dividends on common units/stock | $ |  | $ 5,000 |  | $ 3,800 | $ 5,500 | $ 0 | $ 8,800 | $ 3,800 | $ 2,500 | $ 2,500 | $ 5,000 | $ 5,000 | $ 18,100 | $ 15,000
Reverse stock split |  |  |  |  |  |  |  |  |  |  |  |  | 0.083 |
Common stock outstanding post merger (in Shares) | shares |  |  | 17,800,000 |  | 19,672,050 |  |  |  | 0 |  |  |  | 19,672,050 | 0
Share-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,104 | $ 0
Unit-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 689 | 963
Tengasco |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split |  |  | 0.083 |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (USD per Share) | $ / shares | $ 30.00 |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Long-Term Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for future issuance (in Shares) | shares |  |  | 1,387,022 |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding post merger (in Shares) | shares |  |  |  |  | 989,283 |  |  |  |  |  |  |  | 989,283 |
2021 Long-Term Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in Shares/Units) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 397,739 |
Share-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,104 |
Additional share based compensation to be recognized | $ |  |  |  |  | $ 2,300 |  |  |  |  |  |  |  | $ 2,300 |
Share based compensation to be recognized period |  |  |  |  |  |  |  |  |  |  |  |  | 21 months |
2021 Long-Term Incentive Plan | Restricted Stock | Riley Exploration |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in Shares/Units) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 198,024 |
2018 Long-Term Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in Shares/Units) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 13,309 |
Unit-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 689 | $ 963

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