Note 10 - Supplemental Financial Data - Oil and Gas Producing Activities (Unaudited): Standardized Measure of Discounted Cash Flows (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Details
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Cash Inflows	$ 105,000	$ 110,000
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Production Costs	(12,000)	(13,000)
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows	93,000	97,000
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, 10 Percent Annual Discount for Estimated Timing of Cash Flows	(27,000)	(29,000)
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves	$ 66,000	$ 68,000