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Note 1 - Summary of Significant Accounting Policies - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Regulatory assets | $ 5,103,910 | $ 2,854,276
Noncurrent regulatory assets | 4,445,044 | 5,389,445
Total regulatory assets | 9,548,954 | 8,243,721
Regulatory liabilities | 834,278 | 1,632,716
Regulatory cost of retirement obligations | 14,409,847 | 13,029,376
Regulatory Liability, Noncurrent | 19,326,567 | 18,031,693
Total non-current | 33,736,414 | 31,061,069
Total regulatory liabilities | 34,570,692 | 32,693,785
Over-recovery of SAVE Plan Revenues [Member] |  |
Regulatory liabilities | 0 | 146,861
Rate Refund [Member] |  |
Regulatory liabilities | 37,500 | 652,018
Deferred Income Tax Charge [Member] |  |
Regulatory liabilities | 591,764 | 527,034
Regulatory Liability, Noncurrent | 15,468,096 | 16,249,776
Supplier Refund [Member] |  |
Regulatory liabilities | 30,556 | 275,649
Other Deferred Liabilities [Member] |  |
Regulatory liabilities | 174,458 | 31,154
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Liability, Noncurrent | 3,858,471 | 1,781,917
WNA [Member] |  |
Regulatory assets | 919,375 | 414,689
Regulatory Clause Revenues, under-Recovered [Member] |  |
Regulatory assets | 2,690,247 | 1,383,340
Under-recovery of RNG Revenues [Member] |  |
Regulatory assets | 1,331,064 | 797,804
Under-recovery of SAVE Plan Revenues [Member] |  |
Regulatory assets | 107,678 | 0
Pension Costs [Member] |  |
Regulatory assets | 42,785 | 243,017
Noncurrent regulatory assets | 2,998,881 | 3,786,265
Other Deferred Expenses [Member] |  |
Regulatory assets | 12,761 | 15,426
Deferred Gain (Loss) on Early Extinguishment of Debt [Member] |  |
Noncurrent regulatory assets | 1,141,872 | 1,256,059
Total regulatory assets | 1,141,872 | 1,256,059
Other Assets [Member] |  |
Noncurrent regulatory assets | $ 304,291 | $ 347,121

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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