SEGMENT AND GEOGRAPHIC INFORMATION - REPORTING SEGMENTS (Details)	12 Months Ended
	Sep. 30, 2025 USD ($) segment	Sep. 30, 2024 USD ($)
Segment information
Number of reportable segments | segment	2
Number of operating segments | segment	2
Revenues:
Revenue before interest income	$ 13,643,000	$ 17,987,000
Interest income	54,000	88,000
Total revenues	13,697,000	18,075,000
Depletion, depreciation, and amortization:
Depletion, depreciation, and amortization	3,146,000	4,950,000
Impairment:
Impairment of assets	865,000	2,885,000
Operating profit (loss) (before general and administrative expenses):
Operating profit (loss) (before general and administrative expenses)	30,000	303,000
Equity in income of affiliates:
Equity in income of affiliates	0	1,071,000
General and administrative expenses	(6,937,000)	(5,130,000)
Foreign currency loss (gain)	(192,000)	10,000
Interest expense	(7,000)	0
Interest income	54,000	88,000
Loss from continuing operations before income taxes	(7,052,000)	(3,658,000)
Intersegment eliminations | External Customer
Revenues:
Total revenues	0	0
Oil and natural gas
Revenues:
Revenue before interest income	13,563,000	17,396,000
Total revenues	13,563,000	17,396,000
Costs and expenses:
Oil and natural gas operating	8,966,000	9,849,000
Depletion, depreciation, and amortization:
Depletion, depreciation, and amortization	3,144,000	4,947,000
Impairment:
Impairment of assets	865,000	2,885,000
Operating profit (loss) (before general and administrative expenses):
Operating profit (loss) (before general and administrative expenses)	588,000	(285,000)
Land investment
Revenues:
Revenue before interest income	0	500,000
Total revenues	0	500,000
Operating profit (loss) (before general and administrative expenses):
Operating profit (loss) (before general and administrative expenses)	0	500,000
Other
Revenues:
Revenue before interest income	80,000	91,000
Total revenues	134,000	179,000
Depletion, depreciation, and amortization:
Depletion, depreciation, and amortization	2,000	3,000
Operating profit (loss) (before general and administrative expenses):
Operating profit (loss) (before general and administrative expenses)	78,000	88,000
Loss on sale of assets
Operating profit (loss) (before general and administrative expenses):
Operating profit (loss) (before general and administrative expenses)	$ (636,000)	$ 0