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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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Amount of recognized pre-tax gain from the acquisition of assets.

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Number of locations where the request for asset acquisition of natural gas delivery has been approved.

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Number of locations where the acquisition of assets related to natural gas delivery has been requested.

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Represents the recovery costs associated with SAVE eligible expenses.

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The amount of regulated SAVE operating revenues recognized during the period.

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The represented net revenue under the RNG rider program.

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The over-recovery costs related to the RNG rider program.

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The gross revenue for the RNG rider program.

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The sale of environmental credits under the RNG rider program.

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The represented annual revenues under the SAVE program.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-14

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

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Percentage of public utility's approved return on equity.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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