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Note 16 - Regulatory Assets and Liabilities - Schedule of Regulatory Liabilities (Details) - USD ($) | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Regulatory liabilities | $ 2,311,025 | $ 1,632,716
Asset retirement obligations | 10,855,794 | 10,792,831
Regulatory cost of retirement obligations | 13,404,991 | 13,029,376
Regulatory Liability, Noncurrent | 17,883,751 | 18,031,693
Total non-current | 42,144,536 | 41,853,900
Total regulatory liabilities | 44,455,561 | 43,486,616
Over-recovery of Gas Cost [Member] |  |
Regulatory liabilities | 663,505 | 0
Revenue Subject to Refund [Member] |  |
Regulatory liabilities | 176,935 | 146,861
Rate Refund [Member] |  |
Regulatory liabilities | 652,018 | 652,018
Deferred Income Tax Charge [Member] |  |
Regulatory liabilities | 591,765 | 527,034
Regulatory Liability, Noncurrent | 16,101,834 | 16,249,776
Supplier Refund [Member] |  |
Regulatory liabilities | 203,437 | 275,649
Other Deferred Liabilities [Member] |  |
Regulatory liabilities | 23,365 | 31,154
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Liability, Noncurrent | $ 1,781,917 | $ 1,781,917

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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481854/980-405-25-1 + Details
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