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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 |

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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. + References No definition available. + Details
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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 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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