SUPPLEMENTARY OIL AND NATURAL GAS INFORMATION (UNAUDITED) - CHANGES IN THE STANDARDIZED MEASURE OF DISCOUNTED FUTURE NET CASH FLOWS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Changes in the Standardized Measure of Discounted Future Net Cash Flows
Beginning of year	$ 15,850	$ 19,913
Sales of oil and natural gas produced, net of production costs	(4,597)	(7,547)
Net changes in prices and production costs, net of royalties and wellhead taxes	(2,132)	(12,201)
Extensions and discoveries	0	1,725
Net change due to purchases and sales of minerals in place	(3,715)	(895)
Changes in future development costs	2,610	170
Revisions of previous quantity estimates	(1,618)	9,478
Net change in income taxes	(854)	1,786
Accretion of discount	1,156	3,359
Other - changes in the timing of future production and other	354	76
Other - net change in Canadian dollar translation rate	(384)	(14)
Net change	(9,180)	(4,063)
End of year	$ 6,670	$ 15,850