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Note 4 - Rates and Regulatory Matters (Details Textual) | 1 Months Ended
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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