CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net loss	$ (7,111)	$ (5,331)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of taxes of $0	75	0
Retirement plans:
Amortization of accumulated other comprehensive gain into net periodic benefit cost, net of taxes of $0	0	(85)
Net actuarial gain (loss) arising during the period, net of taxes of $0	624	(76)
Total other comprehensive income (loss)	699	(161)
Total comprehensive loss	(6,412)	(5,492)
Less: Comprehensive loss (income) attributable to non-controlling interests	8	(234)
Comprehensive loss attributable to Barnwell Industries, Inc.	$ (6,404)	$ (5,726)