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Note 1 - Summary of Significant Accounting Policies - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Regulatory assets | $ 2,582,838 | $ 5,103,910
Noncurrent regulatory assets | 3,315,082 | 4,445,044
Total regulatory assets | 5,897,920 | 9,548,954
Regulatory liabilities | 1,638,911 | 834,278
Regulatory cost of retirement obligations | 15,869,691 | 14,409,847
Regulatory Liability, Noncurrent | 17,371,430 | 19,326,567
Total non-current | 33,241,121 | 33,736,414
Total regulatory liabilities | 34,880,032 | 34,570,692
Rate Refund [Member] |  |
Regulatory liabilities | 0 | 37,500
Deferred Income Tax Charge [Member] |  |
Regulatory liabilities | 591,764 | 591,764
Regulatory Liability, Noncurrent | 13,649,719 | 15,468,096
Supplier Refund [Member] |  |
Regulatory liabilities | 889,564 | 30,556
Other Deferred Liabilities [Member] |  |
Regulatory liabilities | 157,583 | 174,458
Other Regulatory Assets (Liabilities) [Member] |  |
Regulatory Liability, Noncurrent | 3,721,711 | 3,858,471
WNA [Member] |  |
Regulatory assets | 504,003 | 919,375
Regulatory Clause Revenues, under-Recovered [Member] |  |
Regulatory assets | 750,295 | 2,690,247
Under-recovery of RNG Revenues [Member] |  |
Regulatory assets | 1,019,821 | 1,331,064
Under-recovery of SAVE Plan Revenues [Member] |  |
Regulatory assets | 265,317 | 107,678
Pension Costs [Member] |  |
Regulatory assets | 30,640 | 42,785
Noncurrent regulatory assets | 2,168,902 | 2,998,881
Other Deferred Expenses [Member] |  |
Regulatory assets | 12,762 | 12,761
Deferred Gain (Loss) on Early Extinguishment of Debt [Member] |  |
Noncurrent regulatory assets | 1,027,684 | 1,141,872
Total regulatory assets | 1,027,684 | 1,141,872
Other Assets [Member] |  |
Noncurrent regulatory assets | $ 118,496 | $ 304,291

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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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