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Note 13 - Regulatory Assets and Liabilities - Schedule of Regulatory Liabilities (Details) - USD ($) | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Regulatory liabilities | $ 2,941,359 | $ 834,278
Regulatory cost of retirement obligations | 15,486,948 | 14,409,847
Regulatory Liability, Noncurrent | 18,882,744 | 19,326,567
Total non-current | 34,369,692 | 33,736,414
Total regulatory liabilities | 37,311,051 | 34,570,692
Over-recovery of Gas Cost [Member] |  |
Regulatory liabilities | 1,413,992 | 0
Rate Refund [Member] |  |
Regulatory liabilities | 0 | 37,500
Deferred Income Tax Charge [Member] |  |
Regulatory liabilities | 591,764 | 591,764
Regulatory Liability, Noncurrent | 15,024,273 | 15,468,096
Supplier Refund [Member] |  |
Regulatory liabilities | 891,994 | 30,556
Other Deferred Liabilities [Member] |  |
Regulatory liabilities | 43,609 | 174,458
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Liability, Noncurrent | $ 3,858,471 | $ 3,858,471

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- Definition Regulatory cost of retirement obligations not otherwise included in ARO. + References No definition available. + Details
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- Definition The amount of regulatory liabilities and asset retirement obligations classified as noncurrent. + References No definition available. + 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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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current 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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- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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