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Note 4 - Rates and Regulatory Matters (Details Textual) |  |  |  |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 ($) | Dec. 31, 2023 USD ($) | Jul. 19, 2022 | 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% |  |  |  |  |  |  |
Regulated Operating Revenue, SAVE Revenue |  |  |  |  |  |  | $ 4,050,000.00 |  |  |
Public Utilities, Approved Rate Increase (Decrease), Amount |  |  |  |  |  | $ 7,450,000 |  |  |  |
Recovery Costs, SAVE Eligible Expenses | $ 9,130,000 |  |  |  | $ 8,500,000 |  |  |  |  |
Investments |  |  |  |  | $ 49,500,000 |  |  |  |  |
SAVE Annual Revenues | $ 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 |  | $ 415,000 |  |  |  |  |  |  |  |
Number of Locations, Natural Gas Delivery Assets, Requested Acquisition |  |  |  |  |  |  |  |  |  | 5
Number of Locations, Natural Gas Delivery Assets, Approved Acquisition |  |  |  |  |  |  |  |  | 2 |
Natural Gas Delivery Assets [Member] | Housing Authority Management [Member] |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Recognized Pre-tax Gain |  |  |  |  |  |  |  | $ 311,000 |  |

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