Note 11 - Supplemental Financial Data - Oil and Gas Producing Activities (Unaudited): Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
Details
Proved, developed properties	$ 300,000	$ 311,000
Less: accumulated depreciation, depletion and impairment	(277,000)	(285,000)
Oil and Gas, Capitalized Cost, after Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance	$ 23,000	$ 26,000