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Note 4 - Regulatory Matters (Details Textual)											12 Months Ended
	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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-Topic 944
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-Section 55
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