Note 11 - Supplemental Financial Data - Oil and Gas Producing Activities (Unaudited): Standardized Measure of Discounted Cash Flows (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
Details
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Future Cash Inflow	$ 137,000	$ 130,000
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Production Cost	(16,000)	(15,000)
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Future Net Cash Flow, before Discount	121,000	115,000
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Discount	(50,000)	(43,000)
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Future Net Cash Flow, after Discount	$ 71,000	$ 72,000