Note 9 - 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, 2020

Tables/Schedules

Summary of Changes Present Value of Estimated Future Net Revenue

	Year ended September 30
	2020	2019
Present value of estimated future net revenue, beginning of year	$            58,000	$       120,000
Sales, net of production costs	(30,000)	(52,000)
Net change in prices and cost of future production	(7,000)	(12,000)
Revisions of quantity estimates	(16,000)	(25,000)
Accretion of discount	6,000	12,000
Change in production rates and other	12,000	15,000
Present value of estimated future net revenue, end of year	$            23,000	$        58,000