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Note 8 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Income (loss) before income taxes	$ 14,791,193	$ (43,143,247)
Corporate federal income tax rate	21.00%	21.00%
Income tax expense (benefit) computed at the federal statutory rate	$ 3,106,151	$ (9,060,082)
State income taxes, net of federal income tax expense (benefit)	720,749	(2,033,695)
Net amortization of excess deferred taxes on regulated operations	(162,228)	(162,228)
Amortization of R&D tax credits	(131,620)	(170,864)
Net amortization of RNG tax credits	(58,669)	0
Other, net	17,528	16,224
Total income tax expense (benefit)	$ 3,491,911	$ (11,410,645)

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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