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Note 13 - Regulatory Assets and Liabilities - Schedule of Regulatory Liabilities (Details) - USD ($) | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Regulatory liabilities | $ 718,331 | $ 1,632,716
Asset retirement obligations | 11,027,988 | 10,792,831
Regulatory cost of retirement obligations | 14,036,454 | 13,029,376
Regulatory Liability, Noncurrent | 17,587,869 | 18,031,693
Total non-current | 42,652,311 | 41,853,900
Total regulatory liabilities | 43,370,642 | 43,486,616
Revenue Subject to Refund [Member] |  |
Regulatory liabilities | 85,815 | 146,861
Rate Refund [Member] |  |
Regulatory liabilities | 0 | 652,018
Deferred Income Tax Charge [Member] |  |
Regulatory liabilities | 591,765 | 527,034
Regulatory Liability, Noncurrent | 15,805,952 | 16,249,776
Supplier Refund [Member] |  |
Regulatory liabilities | 32,964 | 275,649
Other Deferred Liabilities [Member] |  |
Regulatory liabilities | 7,787 | 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/1943274/2147477571/980-405-25-1 + Details
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