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Note 5 - Rates and Regulatory Matters (Details Textual)	1 Months Ended
	Nov. 30, 2021 USD ($)
American Rescue Plan Act, Funds Received	$ 850,000

X

- Definition

The amount of funds received under the American Rescue Plan Act.

+ References

No definition available.

+ Details

Name:	rgco_AmericanRescuePlanActFundsReceived
Namespace Prefix:	rgco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration