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Note 4 - Regulatory Matters (Details Textual) |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |
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Oct. 16, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 04, 2024 USD ($) | Jun. 28, 2024 USD ($) | May 30, 2024 USD ($) | Feb. 02, 2024 USD ($) | Jul. 07, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 21, 2022 USD ($) | Dec. 02, 2022 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 02, 2022
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  | $ 4,330,000 |  |  |  | $ 8,550,000 |  |  |  |
Public Utilities, Approved Return on Equity, Percentage |  |  |  |  |  | 9.44% |  |  |  |  |  |  |  |
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  | 10.35% |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  |  |  |  | $ 7,450,000 |  |  |  |  |
Effect of Change in Deprecation Rate on Depreciation Expense |  |  |  |  |  |  |  |  |  |  | $ 226,000 |  |  |
Regulated Operating Revenue, SAVE Revenue |  |  |  |  |  |  |  |  |  | $ 4,050,000.00 |  |  |  |
Recovery Costs, SAVE Eligible Expenses |  |  |  | $ 9,130,000 |  |  |  | $ 8,500,000 |  |  |  |  |  |
Investments |  |  |  |  |  |  |  | $ 49,500,000 |  |  |  |  |  |
SAVE Annual Revenues |  | $ 1,390,000 |  | $ 1,530,000 |  |  | $ 366,000 |  |  |  |  |  |  |
RNG Rider Revenue Requirement |  |  |  |  | $ 1,560,000 |  |  |  |  |  |  |  |  |
RNG Rider Sale of Environmental Credits |  |  |  |  | 1,110,000 |  |  |  |  |  |  |  |  |
RNG Rider, Over-Recovery Costs |  |  |  |  | 35,000 |  |  |  |  |  |  |  |  |
RNG Rider, Net Revenue |  |  | $ 356,000 |  | $ 415,000 |  |  |  |  |  |  |  |  |
Number of Locations, Natural Gas Delivery Assets, Requested Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  | 5
Number of Locations, Natural Gas Delivery Assets, Approved Acquisition |  | 1 |  |  |  |  |  |  |  |  | 1 | 1 | 2 |
Natural Gas Delivery Assets [Member] | Housing Authority Management [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Recognized Pre-tax Gain |  |  |  |  |  |  |  |  |  |  | $ 782,000 | $ 311,000 | $ 219,000 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Return on Equity, Percentage | 9.90% |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 4,080,000.00 |  |  |  |  |  |  |  |  |  |  |  |  |

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