Note 10 - Supplemental Financial Data - Oil and Gas Producing Activities (Unaudited): Standardized Measure of Discounted Cash Flows (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020
Details
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Cash Inflows	$ 51,000	$ 33,000
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Production Costs	(6,000)	(2,000)
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows	45,000	31,000
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Ten Percent Annual Discount for Estimated Timing of Cash Flows	(12,000)	(8,000)
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves	$ 33,000	$ 23,000