XML 62 R50.htm IDEA: XBRL DOCUMENT v3.24.1.u1

Note 7 - Long-term Debt - Long-term Debt (Details) (Parentheticals) - USD ($)	6 Months Ended	12 Months Ended
	Mar. 31, 2024	Sep. 30, 2023	Apr. 03, 2023
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) [Member]	Secured Overnight Financing Rate (SOFR) [Member]
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Senior Notes Payable, at 4.26%, Due on September 18, 2034 [Member]
Stated rate	4.26%	4.26%
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 3.58%, Due on October 2, 2027 [Member]
Stated rate	3.58%	3.58%
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 4.41 %, Due on March 28, 2031 [Member]
Stated rate	4.41%	4.41%
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 3.60%, Due on December 6, 2029 [Member]
Stated rate	3.60%	3.60%
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]
Debt Instrument, Basis Spread on Variable Rate	1.20%	1.20%
Derivative, Fixed Interest Rate	2.00%	2.00%
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term note payable, at Term SOFR plus 1.00%, due October 1, 2028 [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%	1.00%
Derivative, Fixed Interest Rate	2.49%	2.49%
RGC Midstream LLC [Member]
Derivative, Fixed Interest Rate			2.49%
RGC Midstream LLC [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term notes payable, at TERM SOFR plus 2.00%, due December 31, 2024 [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%	2.00%
RGC Midstream LLC [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term note payable, at Daily Simple SOFR plus 1.26448%, due June 12, 2026[Member]
Debt Instrument, Basis Spread on Variable Rate	1.26448%	1.26448%
Derivative, Fixed Interest Rate	3.24%	3.24%
RGC Midstream LLC [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member]
Debt Instrument, Basis Spread on Variable Rate	1.20%	1.20%
Derivative, Fixed Interest Rate	3.14%	3.14%
Debt Instrument, Periodic Payment	$ 41,667	$ 41,667
RGC Midstream LLC [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term note payable, at Daily Simple SOFR plus 1.26448%, due January 1, 2028 [Member]
Debt Instrument, Basis Spread on Variable Rate	1.26448%	1.26448%
Derivative, Fixed Interest Rate	2.443%	2.443%
Debt Instrument, Periodic Payment	$ 400,000	$ 400,000

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of the required periodic payments applied to principal.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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

X

- Definition

Indicates type of variable interest rate on debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477734/942-470-50-3

+ Details

Name:	us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=rgco_RoanokeGasCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=rgco_UnsecuredSeniorNotesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredSeniorNotesPayableAt426DueOnSeptember182034Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredTermNotesPayableAt358DueOnOctober22027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredTermNotesPayableAt441DueOnMarch282031Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredTermNotesPayableAt360DueOnDecember62029Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredTermNotesPayableAt30daySOFRAverage120DueAugust202026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredTermNotePayableAtTermSofrPlus100DueOctober12028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=rgco_RGCMidstreamLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredTermNotesPayableAtTermSofrPlus200DueDecember312024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredTermNotePayableAtDailySimpleSofrPlus126448DueJune122026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredTermNotePayableAt30dayLiborPlus120DueJune12024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=rgco_UnsecuredTermNotePayableAtDailySimpleSofrPlus126448DueJanuary12028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: