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Note 12 - Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)	Dec. 31, 2021	Sep. 30, 2021
Interest rate swap, assets	$ 163,378
Total Assets fair value	163,378
Natural gas purchases	2,082,631	$ 2,728,935
Total Liabilities fair value	2,954,246	3,925,018
Interest Rate Swap [Member]
Interest rate swaps, liabilities	871,615	1,196,083
Fair Value, Inputs, Level 1 [Member]
Interest rate swap, assets	0
Total Assets fair value	0
Natural gas purchases	0	0
Interest rate swaps, liabilities		0
Total Liabilities fair value	0	0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Interest rate swaps, liabilities	0
Fair Value, Inputs, Level 2 [Member]
Interest rate swap, assets	163,378
Total Assets fair value	163,378
Natural gas purchases	2,082,631	2,728,935
Total Liabilities fair value	2,954,246	3,925,018
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Interest rate swaps, liabilities	871,615	1,196,083
Fair Value, Inputs, Level 3 [Member]
Interest rate swap, assets	0
Total Assets fair value	0
Natural gas purchases	0	0
Total Liabilities fair value	0	0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Interest rate swaps, liabilities	$ 0	$ 0

X

- 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.

+ References

No definition available.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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