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Note 5 - Other Investments - Schedule of Other Investments (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024
Investment in unconsolidated affiliates	$ 20,963,192		$ 20,963,192		$ 21,057,222
Cash investment			35,164	$ 3,381	18,258
Equity in earnings of unconsolidated affiliate	801,175	$ 1,229,384	1,655,388	2,697,219
Distribution from unconsolidated affiliate			(1,784,582)	0
Change in investment in unconsolidated affiliates			(94,030)	$ 2,700,600
MVP [Member]
Investment in unconsolidated affiliates	20,819,153		20,819,153		20,948,347
Southgate [Member]
Investment in unconsolidated affiliates	$ 144,039		$ 144,039		$ 108,875

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The amount of change in investment in unconsolidated affiliate.

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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