SEGMENT INFORMATION - REPORTING SEGMENTS (Details)	3 Months Ended
	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)
Segment information
Number of reportable segments | segment	2
Number of operating segments | segment	2
Revenues:
Revenue before interest income	$ 2,731,000	$ 3,908,000
Interest income	15,000	26,000
Total revenues	2,746,000	3,934,000
Depletion, depreciation, and amortization:
Depletion, depreciation, and amortization	592,000	904,000
Impairment:
Impairment of assets	0	613,000
Operating profit (before general and administrative expenses):
Operating profit (before general and administrative expenses)	68,000	(105,000)
Equity in income of affiliates:
Equity in income of affiliates	0	0
General and administrative expenses	(1,616,000)	(1,163,000)
Foreign currency gain (loss)	47,000	(351,000)
Interest income	15,000	26,000
Loss from continuing operations before income taxes	(1,486,000)	(1,593,000)
Intersegment eliminations | External Customer
Revenues:
Total revenues	0
Oil and natural gas
Revenues:
Revenue before interest income	2,630,000	3,897,000
Total revenues	2,630,000	3,897,000
Costs and expenses:
Oil and natural gas operating	2,071,000	2,496,000
Depletion, depreciation, and amortization:
Depletion, depreciation, and amortization	591,000	904,000
Impairment:
Impairment of assets	0	613,000
Operating profit (before general and administrative expenses):
Operating profit (before general and administrative expenses)	(32,000)	(116,000)
Land investment
Revenues:
Revenue before interest income	70,000	0
Total revenues	70,000	0
Operating profit (before general and administrative expenses):
Operating profit (before general and administrative expenses)	70,000	0
Other
Revenues:
Revenue before interest income	31,000	11,000
Total revenues	46,000	37,000
Depletion, depreciation, and amortization:
Depletion, depreciation, and amortization	1,000	0
Operating profit (before general and administrative expenses):
Operating profit (before general and administrative expenses)	$ 30,000	$ 11,000