CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Revenues	$ 3,998,000	$ 4,582,000	$ 8,385,000	$ 9,432,000
Costs and expenses:
General and administrative	1,928,000	2,031,000	3,113,000	3,527,000
Depletion, depreciation, and amortization	227,000	687,000	503,000	1,392,000
Impairment of assets	0	1,637,000	630,000	1,637,000
Interest expense	3,000	0	4,000	0
Gain on sale of asset	0	(1,336,000)	0	(1,336,000)
Total costs and expenses	5,382,000	6,075,000	10,017,000	11,303,000
Loss before equity in income (loss) of affiliates and income taxes	(1,384,000)	(1,493,000)	(1,632,000)	(1,871,000)
Equity in income (loss) of affiliates	624,000	(25,000)	1,678,000	(68,000)
(Loss) earnings before income taxes	(760,000)	(1,518,000)	46,000	(1,939,000)
Income tax provision (benefit)	34,000	0	97,000	(2,000)
Net loss	(794,000)	(1,518,000)	(51,000)	(1,937,000)
Less: Net earnings (loss) attributable to non-controlling interests	62,000	(4,000)	221,000	(9,000)
Net loss attributable to Barnwell Industries, Inc.	$ (856,000)	$ (1,514,000)	$ (272,000)	$ (1,928,000)
Basic and diluted net loss per common share attributable to Barnwell Industries, Inc. stockholders (in dollars per share)	$ (0.10)	$ (0.18)	$ (0.03)	$ (0.23)
Weighted-average number of common shares outstanding:
Basic and diluted (in shares)	8,277,160	8,277,160	8,277,160	8,277,160
Oil and natural gas
Revenues:
Revenues	$ 2,552,000	$ 1,910,000	$ 4,439,000	$ 4,051,000
Costs and expenses:
Costs and expenses	1,759,000	1,285,000	3,194,000	2,498,000
Depletion, depreciation, and amortization	146,000	584,000	341,000	1,190,000
Impairment of assets	0	1,637,000	630,000	1,637,000
Contract drilling
Revenues:
Revenues	1,389,000	2,593,000	3,331,000	5,239,000
Costs and expenses:
Costs and expenses	1,465,000	1,771,000	2,573,000	3,585,000
Depletion, depreciation, and amortization	77,000	91,000	153,000	176,000
Land investment
Revenues:
Revenues	0	0	485,000	0
Gas processing and other
Revenues:
Revenues	57,000	79,000	130,000	142,000
Costs and expenses:
Depletion, depreciation, and amortization	$ 4,000	$ 12,000	$ 9,000	$ 26,000