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SUBSEQUENT EVENTS	3 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2021
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS Oil and Natural Gas Property Acquisitions Subsequent to December 31, 2021, Barnwell acquired additional working interests in oil and natural gas properties located in the Twining area of Alberta, Canada for consideration of approximately $1,250,000. The purchase price per the agreement was adjusted for customary purchase price adjustments to reflect the economic activity from the effective date to the closing date. The final determination of the customary adjustments to the purchase price has not yet been made, however it is not expected to result in a material adjustment. This transaction will be reflected in Barnwell's quarter ending March 31, 2022.