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Note 1 - Summary of Significant Accounting Policies - Composition of Utility Plant (Details) - USD ($) | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Distribution and transmission | $ 330,895,437 | $ 312,999,348
LNG storage | 15,863,849 | 15,437,447
General and miscellaneous | 20,084,067 | 17,427,213
Total utility property in service | $ 366,843,353 | $ 345,864,008

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