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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