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Note 9 - Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)	Mar. 31, 2025	Sep. 30, 2024
Total Assets fair value	$ 1,879,398	$ 2,062,551
Natural gas purchases	92,716	761,020
Total Liabilities fair value	92,716	761,020
Fair Value, Inputs, Level 1 [Member]
Interest rate swaps, assets		0
Total Assets fair value	0	0
Natural gas purchases	0	0
Total Liabilities fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Total Assets fair value	1,879,398	2,062,551
Natural gas purchases	92,716	761,020
Total Liabilities fair value	92,716	761,020
Fair Value, Inputs, Level 3 [Member]
Total Assets fair value	0	0
Natural gas purchases	0	0
Total Liabilities fair value	0	0
Interest Rate Swap [Member]
Interest rate swaps, assets	1,879,398	2,062,551
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
Interest rate swaps, assets	0
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Interest rate swaps, assets	1,879,398	2,062,551
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate swaps, assets	$ 0	$ 0

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- Definition

Fair market value estimated at the corresponding first of month index prices for which the obligation, the timing difference between the payment for natural gas purchases and the actual receipt of such purchases under the current asset management contract, is expected to be settled.

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