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Note 11 - Commitments and Contingencies (Details Textual) | 3 Months Ended
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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