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Note 12 - Income Taxes (Details Textual)	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Effective Income Tax Rate Reconciliation, at Federal and State Statutory Income Tax Rate, Percent	25.74%	25.74%	25.74%	25.74%

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- Definition

Percentage of the combined domestic federal and state statutory tax rate applicable to pretax income (loss).

+ References

No definition available.

+ Details

Name:	rgco_EffectiveIncomeTaxRateReconciliationAtFederalAndStateStatutoryIncomeTaxRatePercent
Namespace Prefix:	rgco_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration