SEGMENT INFORMATION - REPORTING SEGMENTS (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)
Segment information
Number of reportable segments | segment			2
Number of operating segments | segment			2
Revenues:
Revenue before interest income	$ 2,497,000	$ 3,565,000	$ 5,228,000	$ 7,473,000
Interest income	38,000	4,000	53,000	30,000
Total revenues	2,535,000	3,569,000	5,281,000	7,503,000
Depletion, depreciation, and amortization:
Depletion, depreciation, and amortization	561,000	754,000	1,153,000	1,658,000
Impairment:
Impairment of assets	0	52,000	0	665,000
Operating profit (before general and administrative expenses):
Operating profit (before general and administrative expenses)	93,000	773,000	161,000	668,000
Equity in income of affiliates	338,000	0	338,000	0
General and administrative expenses	(1,521,000)	(2,162,000)	(3,137,000)	(3,325,000)
Foreign currency gain (loss)	(58,000)	10,000	(11,000)	(341,000)
Interest expense	0	(1,000)	0	(1,000)
Interest income	38,000	4,000	53,000	30,000
Loss from continuing operations before income taxes	(1,110,000)	(1,376,000)	(2,596,000)	(2,969,000)
Intersegment eliminations | External Customer
Revenues:
Total revenues			0
Oil and natural gas
Revenues:
Revenue before interest income	2,483,000	3,543,000	5,113,000	7,440,000
Total revenues	2,483,000	3,543,000	5,113,000	7,440,000
Costs and expenses:
Oil and natural gas operating	1,843,000	1,986,000	3,914,000	4,482,000
Depletion, depreciation, and amortization:
Depletion, depreciation, and amortization	553,000	753,000	1,144,000	1,657,000
Impairment:
Impairment of assets	0	52,000	0	665,000
Operating profit (before general and administrative expenses):
Operating profit (before general and administrative expenses)	87,000	752,000	55,000	636,000
Land investment
Revenues:
Revenue before interest income	0	0	70,000	0
Total revenues	0	0	70,000	0
Operating profit (before general and administrative expenses):
Operating profit (before general and administrative expenses)	0	0	70,000	0
Other
Revenues:
Revenue before interest income	14,000	22,000	45,000	33,000
Total revenues	52,000	26,000	98,000	63,000
Depletion, depreciation, and amortization:
Depletion, depreciation, and amortization	8,000	1,000	9,000	1,000
Operating profit (before general and administrative expenses):
Operating profit (before general and administrative expenses)	$ 6,000	$ 21,000	$ 36,000	$ 32,000