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Note 1 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Regulatory Assets and Liabilities [Table Text Block] |
|  | September 30 |
|  | 2025 |  |  | 2024 |
Assets: |  |  |  |  |  |  |  |
Current Assets: |  |  |  |  |  |  |  |
Regulatory assets: |  |  |  |  |  |  |  |
Accrued WNA revenues |  | $ | 504,003 |  |  | $ | 919,375 |
Under-recovery of natural gas costs |  |  | 750,295 |  |  |  | 2,690,247 |
Under-recovery of RNG revenues |  |  | 1,019,821 |  |  |  | 1,331,064 |
Under-recovery of SAVE Plan revenues |  |  | 265,317 |  |  |  | 107,678 |
Accrued pension |  |  | 30,640 |  |  |  | 42,785 |
Other deferred expenses |  |  | 12,762 |  |  |  | 12,761 |
Total current |  |  | 2,582,838 |  |  |  | 5,103,910 |
Other Non-Current Assets: |  |  |  |  |  |  |  |
Regulatory assets: |  |  |  |  |  |  |  |
Premium on early retirement of debt |  |  | 1,027,684 |  |  |  | 1,141,872 |
Accrued pension |  |  | 2,168,902 |  |  |  | 2,998,881 |
Other deferred expenses |  |  | 118,496 |  |  |  | 304,291 |
Total non-current |  |  | 3,315,082 |  |  |  | 4,445,044 |
Total regulatory assets |  | $ | 5,897,920 |  |  | $ | 9,548,954 |
Liabilities and Stockholders' Equity: |  |  |  |  |  |  |  |
Current Liabilities: |  |  |  |  |  |  |  |
Regulatory liabilities: |  |  |  |  |  |  |  |
Rate refund |  | $ | — |  |  | $ | 37,500 |
Deferred income taxes |  |  | 591,764 |  |  |  | 591,764 |
Supplier refunds |  |  | 889,564 |  |  |  | 30,556 |
Other deferred liabilities |  |  | 157,583 |  |  |  | 174,458 |
Total current |  |  | 1,638,911 |  |  |  | 834,278 |
Deferred Credits and Non-Current Other Liabilities: |  |  |  |  |  |  |  |
Regulatory cost of retirement obligations |  |  | 15,869,691 |  |  |  | 14,409,847 |
Regulatory liabilities: |  |  |  |  |  |  |  |
Deferred income taxes |  |  | 13,649,719 |  |  |  | 15,468,096 |
Deferred postretirement medical |  |  | 3,721,711 |  |  |  | 3,858,471 |
Total non-current |  |  | 33,241,121 |  |  |  | 33,736,414 |
Total regulatory liabilities |  | $ | 34,880,032 |  |  | $ | 34,570,692 |
Public Utility Property, Plant, and Equipment [Table Text Block] |
|  | September 30 |
|  | 2025 |  |  | 2024 |
Distribution and transmission |  | $ | 330,895,437 |  |  | $ | 312,999,348 |
LNG storage |  |  | 15,863,849 |  |  |  | 15,437,447 |
General and miscellaneous |  |  | 20,084,067 |  |  |  | 17,427,213 |
Total utility property in service |  | $ | 366,843,353 |  |  | $ | 345,864,008 |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
|  | Years Ended September 30 |
|  | 2025 |  |  | 2024 |
Beginning balance |  | $ | 11,142,095 |  |  | $ | 10,792,831 |
Liabilities incurred |  |  | 72,502 |  |  |  | 86,483 |
Liabilities settled |  |  | (138,391 | ) |  |  | (168,913 | )
Accretion |  |  | 564,229 |  |  |  | 582,383 |
Revisions to estimates and other |  |  | — |  |  |  | (150,689 | )
Ending balance |  | $ | 11,640,435 |  |  | $ | 11,142,095 |
Financing Receivable, Allowance for Credit Loss [Table Text Block] |
|  | Years Ended September 30 |
|  | 2025 |  |  | 2024 |
Beginning balance |  | $ | 153,347 |  |  | $ | 155,164 |
Provision for credit losses |  |  | 278,606 |  |  |  | 110,676 |
Recoveries of accounts written off |  |  | 140,727 |  |  |  | 173,660 |
Accounts written off |  |  | (429,769 | ) |  |  | (286,153 | )
Ending balance |  | $ | 142,911 |  |  | $ | 153,347 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Years Ended September 30 |
|  | 2025 |  |  | 2024 |
Net income |  | $ | 13,279,970 |  |  | $ | 11,760,896 |
Weighted-average common shares |  |  | 10,304,109 |  |  |  | 10,152,909 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Options to purchase common stock |  |  | 4,577 |  |  |  | 3,571 |
Diluted average common shares |  |  | 10,308,686 |  |  |  | 10,156,480 |
Earnings per share of common stock: |  |  |  |  |  |  |  |
Basic |  | $ | 1.29 |  |  | $ | 1.16 |
Diluted |  | $ | 1.29 |  |  | $ | 1.16 |
Comprehensive Income (Loss) [Table Text Block] |
|  |  |  |  |  | Tax |  |  |  |  |
|  | Before Tax |  |  | (Expense) |  |  | Net of Tax |
|  | Amount |  |  | or Benefit |  |  | Amount |
Year Ended September 30, 2025: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains |  | $ | 207,015 |  |  | $ | (53,287 | ) |  | $ | 153,728 |
Transfer of realized gains to interest expense |  |  | (1,374,643 | ) |  |  | 353,834 |  |  |  | (1,020,809 | )
Net interest rate swaps |  |  | (1,167,628 | ) |  |  | 300,547 |  |  |  | (867,081 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Net losses arising during period |  |  | (282,941 | ) |  |  | 72,828 |  |  |  | (210,113 | )
Amortization of actuarial losses |  |  | 16,638 |  |  |  | (4,283 | ) |  |  | 12,355 |
Net defined benefit plans |  |  | (266,303 | ) |  |  | 68,545 |  |  |  | (197,758 | )
Other comprehensive loss |  | $ | (1,433,931 | ) |  | $ | 369,092 |  |  | $ | (1,064,839 | )
Year Ended September 30, 2024: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses |  | $ | (554,778 | ) |  | $ | 142,800 |  |  | $ | (411,978 | )
Transfer of realized gains to interest expense |  |  | (2,000,126 | ) |  |  | 514,831 |  |  |  | (1,485,295 | )
Net interest rate swaps |  |  | (2,554,904 | ) |  |  | 657,631 |  |  |  | (1,897,273 | )
Defined benefit plans: |  |  |  |  |  |  |  |  |  |  |  |
Net gains arising during period |  |  | 1,233,462 |  |  |  | (317,492 | ) |  |  | 915,970 |
Amortization of actuarial losses |  |  | 73,505 |  |  |  | (18,920 | ) |  |  | 54,585 |
Net defined benefit plans |  |  | 1,306,967 |  |  |  | (336,412 | ) |  |  | 970,555 |
Other comprehensive loss |  | $ | (1,247,937 | ) |  | $ | 321,219 |  |  | $ | (926,718 | )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Interest Rate Swaps |  |  | Defined Benefit Plans |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance September 30, 2023 |  | $ | 3,428,922 |  |  | $ | (1,175,633 | ) |  | $ | 2,253,289 |
Other comprehensive income (loss) |  |  | (1,897,273 | ) |  |  | 970,555 |  |  |  | (926,718 | )
Balance September 30, 2024 |  |  | 1,531,649 |  |  |  | (205,078 | ) |  |  | 1,326,571 |
Other comprehensive loss |  |  | (867,081 | ) |  |  | (197,758 | ) |  |  | (1,064,839 | )
Balance September 30, 2025 |  | $ | 664,568 |  |  | $ | (402,836 | ) |  | $ | 261,732 |

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- Definition Tabular disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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