CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Revenues	$ 5,114	$ 3,984	$ 13,499	$ 13,416
Costs and expenses:
General and administrative	2,227	1,248	5,340	4,775
Depletion, depreciation, and amortization	235	478	738	1,870
Impairment of assets	0	2,689	630	4,326
Interest expense	2	1	6	1
Gain on debt extinguishment	(149)	0	(149)	0
Gain on termination of post-retirement medical plan	(2,341)	0	(2,341)	0
Gain on sale of asset	0	0	0	(1,336)
Total costs and expenses	2,717	7,364	12,734	18,667
Earnings (loss) before equity in income (loss) of affiliates and income taxes	2,397	(3,380)	765	(5,251)
Equity in income (loss) of affiliates	3,348	(111)	5,026	(179)
Earnings (loss) before income taxes	5,745	(3,491)	5,791	(5,430)
Income tax provision (benefit)	191	(24)	288	(26)
Net earnings (loss)	5,554	(3,467)	5,503	(5,404)
Less: Net earnings (loss) attributable to non-controlling interests	576	(11)	797	(20)
Net earnings (loss) attributable to Barnwell Industries, Inc.	$ 4,978	$ (3,456)	$ 4,706	$ (5,384)
Basic and diluted net earnings (loss) per common share attributable to Barnwell Industries, Inc. stockholders	$ 0.59	$ (0.42)	$ 0.57	$ (0.65)
Weighted-average number of common shares outstanding:
Basic and diluted (in shares)	8,398,001	8,277,160	8,317,440	8,277,160
Oil and natural gas
Revenues:
Revenues	$ 2,887	$ 830	$ 7,326	$ 4,881
Costs and expenses:
Costs and expenses	1,717	981	4,911	3,479
Depletion, depreciation, and amortization	155	372	496	1,562
Impairment of assets	0	2,689	630	4,326
Contract drilling
Revenues:
Revenues	889	3,040	4,220	8,279
Costs and expenses:
Costs and expenses	1,026	1,967	3,599	5,552
Depletion, depreciation, and amortization	76	96	229	272
Land investment
Revenues:
Revenues	1,253	0	1,738	0
Gas processing and other
Revenues:
Revenues	85	114	215	256
Costs and expenses:
Depletion, depreciation, and amortization	$ 4	$ 10	$ 13	$ 36