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Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) | Sep. 30, 2025 | Sep. 30, 2024
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Accrued pension and postretirement medical benefits | $ 556,316 | $ 512,778
Regulatory effect of change in federal income tax rate | 2,433,559 | 2,553,086
Cost of gas held in storage | 773,167 | 835,094
Deferred compensation | 1,382,130 | 1,166,850
Impairment of unconsolidated affiliate | 13,722,837 | 14,077,357
Regulatory effect on tax credits | 1,277,006 | 1,437,670
Other | 861,076 | 641,300
Total gross deferred tax assets | 21,006,091 | 21,224,135
Utility property | 20,367,400 | 19,879,747
MVP investment | 2,054,156 | 1,586,837
Interest rate swaps | 230,356 | 530,903
Accrued gas cost | 14,339 | 345,464
Total gross deferred tax liabilities | 22,666,251 | 22,342,951
Net deferred tax asset | 617,390 | 771,746
Net deferred tax liability | $ 2,277,550 | $ 1,890,562

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