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Note 1 - Summary of Significant Accounting Policies - Composition of Utility Plant (Details) - USD ($) | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Distribution and transmission | $ 312,999,348 | $ 286,200,652
LNG storage | 15,437,447 | 15,407,053
General and miscellaneous | 17,427,213 | 16,762,186
Total utility property in service | $ 345,864,008 | $ 318,369,891

X
- Definition Period end amount of property, plant and equipment (PPE) related to liquefied natural gas (LNG) facility owned by public utility. + References No definition available. + Details
Name: | rgco_PublicUtilitiesPropertyPlantAndEquipmentLiquefiedNaturalGas
Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of other property, plant and equipment (PPE) owned (but not classified elsewhere) by the public utility. + References No definition available. + Details
Name: | rgco_PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipmentGross
Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of total gross PPE. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Period end amount of property, plant and equipment (PPE) related to transmission and distribution owned by public utility. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentTransmissionAndDistribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant