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Note 9 - Employee Benefit Plans - Changes in Benefit Plan Liabilities (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Forfeitures	$ (18,221)	$ 0
NQDC Plan [Member]
Beginning deferred compensation balance	59,108	35,344
Employer contributions	0	33,280
Earnings (loss)	6,787	(9,516)
Ending deferred compensation balance	$ 47,674	$ 59,108

X

- Definition

The amount of distributions on deferred contribution plan.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of earnings on deferred contribution plan.

+ References

No definition available.

+ Details

Name:	rgco_DeferredContributionPlanEarnings
Namespace Prefix:	rgco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

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

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=rgco_NQDCPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: