Name:	rgco_FranchiseFeeTotalCostThroughEndOfAgreement
Namespace Prefix:	rgco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of gate stations.

+ References

No definition available.

+ Details

Name:	rgco_NumberOfGateStations
Namespace Prefix:	rgco_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents purchase commitment minimum volume required.

+ References

No definition available.

+ Details

Name:	rgco_PurchaseCommitmentMinimumVolumeRequired
Namespace Prefix:	rgco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

represents purchase commitment purchase price per energy volume.

+ References

No definition available.

+ Details

Name:	rgco_PurchaseCommitmentPurchasePricePerEnergyVolume
Namespace Prefix:	rgco_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

Name:	us-gaap_CostOfGoodsAndServicesSold
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_OtherCommitmentsAxis=rgco_ContractForGateStationsThatInterconnectWithMvpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=rgco_NaturalGasPipelineAndStorageCapacityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 12 - Commitments and Contingencies (Details Textual)	1 Months Ended	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2023 USD ($) $ / item	Sep. 30, 2022 USD ($)
Asset Management Contract Term (Year)	2 years
Purchase Commitment Minimum Volume Required		$ 1,100,000
Franchise Agreement Term (Year)		20 years
Franchise Fee Annual Increase		3.00%
Franchise Fee Total Cost Through End of Agreement		$ 1,942,731
Contract for Gate Stations That Interconnect With MVP [Member]
Other Commitment		$ 1,200,000
Number of Gate Stations		2
Natural Gas Pipeline And Storage Capacity [Member]
Cost of Goods and Services Sold		$ 44,253,000	$ 51,408,000
Minimum [Member]
Purchase Commitment Purchase Price Per Energy Volume (in USD per Per Share) \| $ / item		2.75
Maximum [Member]
Purchase Commitment Purchase Price Per Energy Volume (in USD per Per Share) \| $ / item		4.57