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Acquisitions and Divestitures - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 26, 2021 USD ($) a well $ / shares shares | Dec. 20, 2019 USD ($) a well | Jun. 30, 2021 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Apr. 02, 2021 USD ($) | Mar. 10, 2021 USD ($) | Sep. 30, 2020 $ / shares shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (USD per Share) | $ / shares |  |  | $ 0.001 |  |  |  |  | $ 0.001 |  |  |  | $ 0.001
Reverse stock split |  |  |  | 83.000 |  |  |  |  |  |  |  |
Common stock outstanding post merger (in Shares) | shares | 17,800,000 |  | 18,021,521 |  |  |  |  | 18,021,521 |  |  |  | 0
Transaction costs |  |  | $ 321 |  |  | $ 15 |  | $ 3,534 | $ 42 |  |  |
Loss on discontinued operations |  |  | (967) |  |  | $ 0 |  | (19,573) | $ 0 |  |  |
Transaction costs |  |  | 200 | $ 2,200 | $ 1,000 |  |  |  |  |  |  |
Kansas Properties |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration from discontinued operations |  |  |  |  |  |  |  |  |  | $ 3,500 | $ 3,500 |
Consideration from discontinued operations, closing adjustments |  |  |  |  |  |  |  |  |  | $ 200 |  |
Pro Forma |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  | $ 3,400 |  |  |  |  |
Impairment of oil and gas properties |  |  |  |  | $ 900 |  |  |  |  |  |  |
Kansas Properties |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on discontinued operations |  |  | 1,000 |  |  |  |  | 19,600 |  |  |  |
Kansas Properties | Oil |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of net acres acquired | a | 11,000 |  |  |  |  |  |  |  |  |  |  |
Number of wells acquired, producing | well | 153 |  |  |  |  |  |  |  |  |  |  |
Number of wells acquired, shut-in | well | 19 |  |  |  |  |  |  |  |  |  |  |
Number of wells acquired, temporarily abandoned | well | 6 |  |  |  |  |  |  |  |  |  |  |
Number of wells acquired, active disposal | well | 36 |  |  |  |  |  |  |  |  |  |  |
J. Cleo Thompson and James Cleo Thompson, Jr., L.P. | Natural gas |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of net acres acquired | a |  | 1,237 |  |  |  |  |  |  |  |  |  |
Number of wells acquired, producing | well |  | 11 |  |  |  |  |  |  |  |  |  |
Number of wells acquired | well |  | 17 |  |  |  |  |  |  |  |  |  |
Number of wells acquired, salt water disposal | well |  | 6 |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 3,300 |  |  |  |  |  |  |  |  |  |
Riley Exploration |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ 26,392 |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  | 4,800 |  |  |  |
Transaction costs, success fees |  |  |  |  |  |  |  | 1,750 |  |  |  |
Acquisition related costs, paid at closing |  |  | 300 |  |  |  |  | $ 300 |  |  |  |
Acquisition related costs, paid at closing, period |  |  |  |  |  |  |  | 30 days |  |  |  |
Loss of acquiree since acquisition date, actual |  |  |  |  |  |  |  | $ 115 |  |  |  |
Riley Exploration | General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  | $ 300 |  |  |  |  | $ 3,400 |  |  |  |
TGC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (USD per Share) | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
Stock conversion ratio | 97.796467 |  |  |  |  |  |  |  |  |  |  |
Reverse stock split | 0.083 |  |  |  |  |  |  |  |  |  |  |

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