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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