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Note 4 - Income Taxes (Details Textual)	3 Months Ended	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal and State Statutory Income Tax Rate, Percent	25.74%	25.74%
Effective Income Tax Rate Reconciliation, Percent, Excluding Impairment	24.00%	23.70%

X

- 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

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) excluding the impaired investment.

+ References

No definition available.

+ Details

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