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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%

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