Note 10 - Supplemental Financial Data - Oil and Gas Producing Activities (Unaudited): Summary of Changes Present Value of Estimated Future Net Revenue (Tables)

12 Months Ended

Sep. 30, 2021

Tables/Schedules

Summary of Changes Present Value of Estimated Future Net Revenue

	Year ended September 30
	2021	2020
Present value of estimated future net revenue, beginning of year	$23,000	$58,000
Sales, net of production costs	(41,000)	(30,000)
Net change in prices and cost of future production	18,000	(7,000)
Revisions of quantity estimates	27,000	(16,000)
Accretion of discount	3,000	6,000
Change in production rates and other	3,000	12,000
Present value of estimated future net revenue, end of year	$33,000	$23,000