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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, 2024
Sep. 30, 2023
Changes in the Standardized Measure of Discounted Future Net Cash Flows    
Beginning of year $ 19,913 $ 27,878
Sales of oil and natural gas produced, net of production costs (7,547) (8,942)
Net changes in prices and production costs, net of royalties and wellhead taxes (12,201) (11,913)
Extensions and discoveries 1,725 10,767
Net change due to purchases and sales of minerals in place (895) 0
Changes in future development costs 170 (2,959)
Revisions of previous quantity estimates 9,478 2,227
Net change in income taxes 1,786 2,868
Accretion of discount 3,359 905
Other - changes in the timing of future production and other 76 (1,202)
Other - net change in Canadian dollar translation rate (14) 284
Net change (4,063) (7,965)
End of year $ 15,850 $ 19,913