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Note 16 - Leases (Details Textual) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($)
Assets [Abstract] |  |  |
Other Assets, Miscellaneous, Noncurrent |  | $ 570,975 | $ 624,095
Liabilities, Current [Abstract] |  |  |
Other Liabilities, Current |  | 31,010 | 30,281
Liabilities, Noncurrent [Abstract] |  |  |
Liabilities, Other than Long-Term Debt, Noncurrent |  | 45,196,399 | $ 44,233,200
Number of Additional Operating Leases | 3 |  |
Operating Lease, Right-of-Use Asset |  | $ 346,786 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  | Other Assets, Miscellaneous, Noncurrent |
Operating Lease, Liability, Current |  | $ 31,010 |
Operating Lease, Liability, Noncurrent |  | $ 319,936 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities, Current |
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  | Liabilities, Other than Long-Term Debt, Noncurrent |
Three Other Operating Leases [Member] |  |  |
Operating Lease, Cost |  | $ 50,000 |
Minimum [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) | 3 years |  |
Maximum [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) | 6 years |  |
RNG [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) | 20 years |  |
Lessee, Operating Lease, Renewal Term (Year) | 5 years |  |

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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- Definition Aggregated carrying amounts of obligations as of the balance sheet date, excluding long-term debt, incurred as part of the normal operations that are expected to be paid after one year or beyond the normal operating cycle, if longer. Alternate captions include Total Deferred Credits and Other Liabilities. + References No definition available. + Details
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