Note 10 - Supplemental Financial Data - Oil and Gas Producing Activities (Unaudited): Summary of Changes Present Value of Estimated Future Net Revenue (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Details
Present value of estimated future net revenue, beginning of year	$ 68,000	$ 33,000
Sales and Transfers of Oil and Gas Produced, Net of Production Costs	(28,000)	(33,000)
Net Increase (Decrease) in Sales and Transfer Prices and Production Costs	(14,000)	24,000
Revisions of quantity estimates	33,000	42,000
Accretion Expense	7,000	4,000
Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Other	0	(2,000)
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves	$ 66,000	$ 68,000