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Note 4 - Rates and Regulatory Matters (Details Textual) - USD ($) | Oct. 16, 2024 | Sep. 30, 2024 | Sep. 04, 2024 | Jun. 28, 2024 | May 30, 2024 | Feb. 02, 2024
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Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  |  |  | $ 4,330,000
Public Utilities, Approved Return on Equity, Percentage | 9.90% |  |  |  |  | 9.44%
Public Utilities, Requested Return on Equity, Percentage |  |  |  |  |  | 10.35%
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 4,080,000.00 |  |  |  |  |
Recovery Costs, SAVE Eligible Expenses |  |  |  | $ 9,130,000 |  |
SAVE Annual Revenues |  | $ 1,390,000 |  | $ 1,530,000 |  |
RNG Rider Revenue Requirement |  |  |  |  | $ 1,560,000 |
RNG Rider Sale of Environmental Credits |  |  |  |  | 1,110,000 |
RNG Rider, Over-Recovery Costs |  |  |  |  | 35,000 |
RNG Rider, Net Revenue |  |  | $ 356,000 |  | $ 415,000 |

X
- Definition Represents the recovery costs associated with SAVE eligible expenses. + References No definition available. + Details
Name: | rgco_RecoveryCostsSaveEligibleExpenses
Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The represented net revenue under the RNG rider program. + References No definition available. + Details
Name: | rgco_RngRiderNetRevenue
Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The over-recovery costs related to the RNG rider program. + References No definition available. + Details
Name: | rgco_RngRiderOverrecoveryCosts
Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The gross revenue for the RNG rider program. + References No definition available. + Details
Name: | rgco_RngRiderRevenueRequirement
Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The sale of environmental credits under the RNG rider program. + References No definition available. + Details
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Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The represented annual revenues under the SAVE program. + References No definition available. + Details
Name: | rgco_SAVEAnnualRevenues
Namespace Prefix: | rgco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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