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OIL AND NATURAL GAS PROPERTIES (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 08, 2021 | Apr. 08, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Oil and Natural Gas Properties [Line Items] |  |  |  |  |
Proceeds from the sale of oil and natural gas assets |  |  |  | $ 581 | $ 608
Income taxes receivable |  |  |  | 530 | 472
Gain on sale of oil and natural gas properties |  |  |  | 818 | 0
Liabilities associated with properties sold |  |  |  | 375 | 169
Payments to acquire oil and natural gas properties |  |  |  | 348 | 0
Impairment of assets |  |  |  | 668 | 4,376
Oil and natural gas |  |  |  |  |
Oil and Natural Gas Properties [Line Items] |  |  |  |  |
Impairment of assets |  |  |  | 630 | $ 4,326
Barnwell Industries Inc | Hillsdown, Alberta, Canada |  |  |  |  |
Oil and Natural Gas Properties [Line Items] |  |  |  |  |
Proceeds from the sale of oil and natural gas assets |  | $ 132 |  |  |
Income taxes receivable |  | 72 |  |  |
Barnwell Industries Inc | Progress |  |  |  |  |
Oil and Natural Gas Properties [Line Items] |  |  |  |  |
Proceeds from the sale of oil and natural gas assets |  |  | $ 594 |  |
Barnwell Industries Inc | Twining, Alberta, Canada |  |  |  |  |
Oil and Natural Gas Properties [Line Items] |  |  |  |  |
Payments to acquire oil and natural gas properties |  | $ 348 |  |  |
Barnwell Industries Inc | Spirit River, Alberta Canada |  |  |  |  |
Oil and Natural Gas Properties [Line Items] |  |  |  |  |
Proceeds from the sale of oil and natural gas assets | $ 1,047 |  |  |  |
Income taxes receivable | $ 526 |  |  |  |
Percent difference in capitalized costs divided by proved reserves if the gain is recorded as opposed to being credited against the full-cost pool | 93.00% |  |  |  |
Gain on sale of oil and natural gas properties |  |  |  | 818 |
Barnwell Industries Inc | Spirit River, Alberta Canada | Asset Purchase and Sale Agreement |  |  |  |  |
Oil and Natural Gas Properties [Line Items] |  |  |  |  |
Liabilities associated with properties sold |  |  |  | $ 77 |

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