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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Sep. 30, 2024 | Sep. 30, 2023
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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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