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v3.23.3

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 |

X
- Definition Represents asset management contract term. + References No definition available. + Details
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Namespace Prefix: | rgco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents franchise agreement term. + References No definition available. + Details
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Namespace Prefix: | rgco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents franchise fee annual increase. + References No definition available. + Details
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Namespace Prefix: | rgco_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents franchise fee total cost through end of agreement. + References No definition available. + Details
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Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of gate stations. + References No definition available. + Details
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Namespace Prefix: | rgco_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents purchase commitment minimum volume required. + References No definition available. + Details
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Namespace Prefix: | rgco_
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Balance Type: | debit
Period Type: | duration

X
- Definition represents purchase commitment purchase price per energy volume. + References No definition available. + Details
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Namespace Prefix: | rgco_
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X
- 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
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X
- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Period Type: |