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OIL AND NATURAL GAS PROPERTIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019
Oil and Natural Gas Properties [Line Items] |  |  |  |
Proceeds from sale of oil and natural gas assets |  |  | $ 608 | $ 1,519
Acquisition costs |  |  | 242 | 668
Impairment of assets |  |  | 4,376 | 5,710
Oil and natural gas |  |  |  |
Oil and Natural Gas Properties [Line Items] |  |  |  |
Impairment of assets |  |  | $ 4,326 | $ 5,710
Wood River and Twining |  |  |  |
Oil and Natural Gas Properties [Line Items] |  |  |  |
Acquisition costs |  | $ 355 |  |
Barnwell Industries Inc | Progress |  |  |  |
Oil and Natural Gas Properties [Line Items] |  |  |  |
Proceeds from sale of oil and natural gas assets | $ 594 |  |  |

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