CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Revenues:
Revenue	$ 13,697	$ 18,075
Costs and expenses:
General and administrative	6,937	5,130
Depletion, depreciation, and amortization	3,146	4,950
Impairment of assets	865	2,885
Foreign currency loss (gain)	192	(10)
Interest expense	7	0
Loss on sale of assets	636	0
Total costs and expenses	20,749	22,804
Loss from continuing operations before equity in income of affiliates and income taxes	(7,052)	(4,729)
Equity in income of affiliates	0	1,071
Loss from continuing operations before income taxes	(7,052)	(3,658)
Income tax provision	71	213
Net loss from continuing operations	(7,123)	(3,871)
Net earnings (loss) from discontinued operations	12	(1,460)
Net loss	(7,111)	(5,331)
Less: Net (loss) earnings attributable to non-controlling interests	(8)	234
Net loss attributable to Barnwell Industries, Inc. stockholders	$ (7,103)	$ (5,565)
Basic and diluted loss per common share attributable to Barnwell Industries, Inc. stockholders:
Basic net loss per common share from continuing operations attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	$ (0.71)	$ (0.41)
Diluted net loss per common share from continuing operations attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	(0.71)	(0.41)
Basic net loss per common share from discontinued operations (in dollars per share)	0	(0.15)
Diluted net loss per common share from discontinued operations (in dollars per share)	0	(0.15)
Basic net loss per common share attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	(0.71)	(0.56)
Diluted net loss per common share attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	$ (0.71)	$ (0.56)
Weighted-average number of common shares outstanding:
Basic (in shares)	10,056,479	10,017,997
Diluted (in shares)	10,056,479	10,017,997
Oil and natural gas
Revenues:
Revenue	$ 13,563	$ 17,396
Costs and expenses:
Oil and natural gas operating	8,966	9,849
Depletion, depreciation, and amortization	3,144	4,947
Impairment of assets	865	2,885
Sale of interest in leasehold land
Revenues:
Revenue	0	500
Gas processing and other
Revenues:
Revenue	134	179
Costs and expenses:
Depletion, depreciation, and amortization	$ 2	$ 3