CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,553)	$ (1,234)	$ (4,679)	$ (3,446)
Other comprehensive (loss) income:
Foreign currency translation adjustments, net of taxes of $0	(37)	12	53	20
Retirement plans:
Amortization of accumulated other comprehensive gain into net periodic benefit cost, net of taxes of $0	0	(21)	0	(64)
Total other comprehensive (loss) income	(37)	(9)	53	(44)
Total comprehensive loss	(1,590)	(1,243)	(4,626)	(3,490)
Less: Comprehensive loss (income) attributable to non-controlling interests	3	(12)	5	(236)
Comprehensive loss attributable to Barnwell Industries, Inc.	$ (1,587)	$ (1,255)	$ (4,621)	$ (3,726)