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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