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Note 14 - Commitments and Contingencies (Details Textual) BTU in Billions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2024 USD ($) BTU $ / item | Sep. 30, 2023 USD ($)
Energy Purchase Obligation Due In Next Twelve Months (British Thermal Unit) | BTU |  | 295 |
Asset Management Contract Term (Year) | 2 years |  |
Purchase Commitment Minimum Volume Required |  | $ 1,820,000 |
Franchise Agreement Term (Year) |  | 20 years |
Franchise Fee Annual Increase |  | 3.00% |
Franchise Fee Total Cost Through End of Agreement |  | $ 1,818,339 |
Natural Gas Pipeline And Storage Capacity [Member] |  |  |
Cost of Goods and Services Sold |  | 30,880,000 | $ 44,253,000
Natural Gas Pipeline And Storage Capacity [Member] | Asset Management Arrangement [Member] |  |  |
Cost of Goods and Services Sold |  | $ 1,048,000 |
Minimum [Member] |  |  |
Purchase Commitment Purchase Price Per Energy Volume (in USD per Per Share) | $ / item |  | 2.36 |
Maximum [Member] |  |  |
Purchase Commitment Purchase Price Per Energy Volume (in USD per Per Share) | $ / item |  | 3.5 |

X
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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)(d)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1 + Details
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