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Note 1 - Summary of Significant Accounting Policies - Summary of Asset Retirement Obligations (Details) - USD ($)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Beginning balance $ 10,792,831 $ 10,204,079
Liabilities incurred 86,483 91,670
Liabilities settled (168,913) (180,865)
Accretion 582,383 677,947
Revisions to estimates and other (150,689) 0
Ending balance $ 11,142,095 $ 10,792,831