EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Net Earnings (Numerator)
Basic	$ 5,513	$ 6,253
Diluted	$ 5,513	$ 6,253
Shares (Denominator)
Basic (in shares)	9,732,936	8,592,154
Effect of dilutive securities-common stock options (in shares)	0	0
Diluted (in shares)	9,732,936	8,592,154
Per-Share Amount
Basic net earnings per common share attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	$ 0.57	$ 0.73
Diluted net earnings per common share attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	$ 0.57	$ 0.73
Options
Antidilutive shares of common stock excluded from the computation of diluted shares
Antidilutive shares excluded from computation of earnings per share (in shares)	615,000	615,000