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Note 3 - Regulatory Matters (Details Textual)				3 Months Ended		12 Months Ended		16 Months Ended
	Jul. 07, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 02, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	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
Public Utilities, Allowance for Funds Used During Construction, Additions						$ 362,685	$ 75,154
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
Roanoke Gas Company [Member]
Public Utilities, Allowance for Funds Used During Construction, Additions								$ 468,000

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

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

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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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Total increase in earnings in the period representing the cost of equity (based on assumed rate of return) and/or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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-Topic 980
-SubTopic 360
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481711/980-360-25-1

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-Topic 980
-SubTopic 340
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481878/980-340-50-3

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

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