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Note 12 - Commitment and Contingencies - Schedule of Volumetric Obligations (Details)	Sep. 30, 2023 Boe
2023-2024 (Barrel of Oil Equivalent)	2,089,220
2024-2025 (Barrel of Oil Equivalent)	295,866
Total (Barrel of Oil Equivalent)	2,385,086

X

- Definition

Represents energy purchase obligation due in next twelve months.

+ References

No definition available.

+ Details

Name:	rgco_EnergyPurchaseObligationDueInNextTwelveMonths
Namespace Prefix:	rgco_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents energy purchase obligation due in second year.

+ References

No definition available.

+ Details

Name:	rgco_EnergyPurchaseObligationDueInSecondYear
Namespace Prefix:	rgco_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the total energy purchase obligation due.

+ References

No definition available.

+ Details

Name:	rgco_EnergyPurchaseObligationDueTotal
Namespace Prefix:	rgco_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	instant