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Note 11 - Commitments and Contingencies (Details Textual)	3 Months Ended
	Dec. 31, 2023
Number of Pipelines	2

X

- Definition

Represents the number of primary pipelines that provide all of the natural gas supplied to the entity's customers.

+ References

No definition available.

+ Details

Name:	rgco_NumberOfPipelines
Namespace Prefix:	rgco_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration