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Note 8 - Fair Value - Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)	Sep. 30, 2025	Sep. 30, 2024
Interest rate swaps	$ 828,573	$ 871,026
Interest rate swaps	421,511	1,191,526
Interest Rate Swap [Member]
Interest rate swaps - current	57,144	0
Interest rate swaps - noncurrent	298,016	0
Fair Value, Recurring [Member]
Total Assets fair value	1,250,084	2,062,552
Natural gas purchases	135,863	761,020
Total Liabilities fair value	491,023	761,020
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total Assets fair value	0	0
Natural gas purchases	0	0
Total Liabilities fair value	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total Assets fair value	1,250,084	2,062,552
Natural gas purchases	135,863	761,020
Total Liabilities fair value	491,023	761,020
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total Assets fair value	0	0
Natural gas purchases	0	0
Total Liabilities fair value	0	0
Fair Value, Recurring [Member] | Interest Rate Swap [Member]
Interest rate swaps	828,573	871,026
Interest rate swaps	421,511	1,191,526
Interest rate swaps - current	57,144
Interest rate swaps - noncurrent	298,016
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member]
Interest rate swaps	0	0
Interest rate swaps	0	0
Interest rate swaps - current	0
Interest rate swaps - noncurrent	0
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Interest rate swaps	828,573	871,026
Interest rate swaps	421,511	1,191,526
Interest rate swaps - current	57,144
Interest rate swaps - noncurrent	298,016
Fair Value, Recurring [Member] | Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Interest rate swaps	0	0
Interest rate swaps		$ 0
Interest rate swaps - current	0
Interest rate swaps - noncurrent	$ 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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- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-10

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Section 55
-Paragraph 10
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+ References

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-Paragraph 10
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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Section 50
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