CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,550)	$ (1,235)	$ (2,212)	$ (26)
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of taxes of $0	(22)	0	8	2
Retirement plans:
Amortization of accumulated other comprehensive gain into net periodic benefit cost, net of taxes of $0	(22)	(20)	(43)	(40)
Total other comprehensive loss	(44)	(20)	(35)	(38)
Total comprehensive loss	(1,594)	(1,255)	(2,247)	(64)
Less: Comprehensive income attributable to non-controlling interests	(222)	(2)	(224)	(122)
Comprehensive loss attributable to Barnwell Industries, Inc.	$ (1,816)	$ (1,257)	$ (2,471)	$ (186)