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Note 9 - Employee Benefit Plans - Changes in Benefit Plan Liabilities (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Forfeitures | $ (18,221) | $ 0
NQDC Plan [Member] |  |
Beginning deferred compensation balance | 59,108 | 35,344
Employer contributions | 0 | 33,280
Earnings (loss) | 6,787 | (9,516)
Ending deferred compensation balance | $ 47,674 | $ 59,108

X
- Definition The amount of distributions on deferred contribution plan. + References No definition available. + Details
Name: | rgco_DeferredContributionPlanDistributions
Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of earnings on deferred contribution plan. + References No definition available. + Details
Name: | rgco_DeferredContributionPlanEarnings
Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=rgco_NQDCPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |