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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023
Accrued pension and postretirement medical benefits	$ 512,778	$ 591,841
Regulatory effect of change in federal income tax rate	2,553,086	2,655,951
Cost of gas held in storage	835,094	752,989
Deferred compensation	1,166,850	1,020,512
Impairment of unconsolidated affiliate	14,077,357	14,180,759
Regulatory effect on tax credits	1,437,670	1,662,400
Other	641,300	452,996
Total gross deferred tax assets	21,224,135	21,317,448
Utility property	19,879,747	19,426,513
MVP investment	1,586,837	1,288,104
Interest rate swaps	530,903	1,188,533
Accrued gas cost	345,464	259,162
Total gross deferred tax liabilities	22,342,951	22,162,312
Net deferred tax asset	771,746	1,163,594
Net deferred tax liability	$ 1,890,562	$ 2,008,458

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