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Note 5 - Rates and Regulatory Matters (Details Textual)					3 Months Ended
	Jul. 07, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 21, 2022 USD ($)	Dec. 02, 2022 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jul. 19, 2022	Jun. 02, 2022
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 8,550,000
Regulated Operating Revenue, SAVE Revenue				$ 4,050,000.00
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 7,450,000
SAVE Plan and Rider for Recovery Costs, Term (Year)	5 years	5 years
Recovery Costs, SAVE Eligible Expenses		$ 8,500,000
Investments	$ 49,500,000	$ 49,500,000
SAVE Annual Revenues	$ 366,000
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	$ 219,000

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Represents the recovery costs associated with SAVE eligible expenses.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The represented annual revenues under the SAVE program.

+ References

No definition available.

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- Definition

Represents the SAVE Plan and Rider term for recovery costs.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(h))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

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X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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