CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,207)	$ (1,550)	$ (3,126)	$ (2,212)
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of taxes of $0	(3)	(22)	90	8
Retirement plans:
Amortization of accumulated other comprehensive gain into net periodic benefit cost, net of taxes of $0	0	(22)	0	(43)
Total other comprehensive (loss) income	(3)	(44)	90	(35)
Total comprehensive loss	(1,210)	(1,594)	(3,036)	(2,247)
Less: Comprehensive (income) loss attributable to non-controlling interests	0	(222)	2	(224)
Comprehensive loss attributable to Barnwell Industries, Inc.	$ (1,210)	$ (1,816)	$ (3,034)	$ (2,471)