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Note 4 - Rates and Regulatory Matters (Details Textual) - USD ($) $ in Thousands | Jun. 30, 2025 | May 30, 2025 | Oct. 16, 2024 | Feb. 02, 2024
--- | --- | --- | --- | ---
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  |  | $ 4,330
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 |
RNG Rider Revenue Requirement |  | $ 1,660 |  |
Recovery Costs, SAVE Eligible Expenses | $ 10,330 |  |  |
SAVE Annual Revenues | $ 2,640 |  |  |

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 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 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
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
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
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
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
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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