XML 59 R48.htm IDEA: XBRL DOCUMENT v3.25.2

Note 7 - Long-term Debt (Details Textual) - USD ($)			1 Months Ended	9 Months Ended	12 Months Ended
	May 02, 2024	Mar. 06, 2024	Jul. 31, 2025	Jun. 30, 2025	Sep. 30, 2024	Mar. 31, 2025	May 29, 2024	Apr. 03, 2023	Aug. 20, 2021
Debt Instruments, Overall Maximum Borrowing Capacity		$ 25,000,000
Unsecured Debt				$ 137,500,000	$ 137,755,000
Regulatory Asset				$ 5,936,982	9,548,954
Debt Instrument, Debt Covenant Ratio of Long-term Debt to Total Capitalization, Maximum				65.00%
Debt Instrument, Debt Covenant, Ratio of Priority Debt to Total Assets, Maximum				15.00%
Debt Instrument, Debt Covenant, Interest Coverage Ratio				1.5
Long-Term Debt, Current Maturities				$ 2,534,514	$ 800,000
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) [Member]	Secured Overnight Financing Rate (SOFR) [Member]	Secured Overnight Financing Rate (SOFR) [Member]		Secured Overnight Financing Rate (SOFR) [Member]
Deferred Gain (Loss) on Early Extinguishment of Debt [Member]
Regulatory Asset				1,056,231	$ 1,141,872
Regulatory Asset, Amortization Period (Year)						20 years
Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 9,000,000			$ 9,000,000
Debt Instrument, Debt Covenant, Interest Coverage Ratio				1.5
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]
Debt Instrument, Face Amount									$ 15,000,000
Amended and Restated Delayed Term Note Entered September 24, 2021 [Member]
Debt Instrument, Face Amount								$ 10,000,000
Subsequent Letter of Commitment to Refinance [Member]
Long-Term Debt, Current Maturities				$ 2,500,000
Subsequent Letter of Commitment to Refinance [Member] | Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate			1.55%
Unsecured Debt			$ 53,600,000
Debt Instrument, Term (Year)			7 years
Debt Instrument, Origination Fee, Percentage			0.30%
RGC Midstream LLC [Member] | Unsecured Debt [Member]
Debt Instrument, Face Amount		$ 8,000,000		$ 8,000,000
RGC Midstream LLC [Member] | Line of Credit [Member]
Debt Instrument, Basis Spread on Variable Rate	2.215%
Line of Credit Facility, Upfront Fee Percentage	0.40%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.125%
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member]
Debt Instrument, Basis Spread on Variable Rate		2.00%
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Variable Rate Upon Meeting Milestones One [Member]
Debt Instrument, Basis Spread on Variable Rate		1.75%
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Variable Rate Upon Meeting Milestones Two [Member]
Debt Instrument, Basis Spread on Variable Rate		1.55%
RGC Midstream LLC [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member] | Unsecured Term Notes [Member]
Unsecured Debt							$ 9,000,000

X

- Definition

Represents the interest coverage ratio requirement.

+ References

No definition available.

+ Details

Name:	rgco_DebtInstrumentDebtCovenantInterestCoverageRatio
Namespace Prefix:	rgco_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum debt covenant ratio of long-term debt to total capitalization of a debt instrument.

+ References

No definition available.

+ Details

Name:	rgco_DebtInstrumentDebtCovenantRatioOfLongtermDebtToTotalCapitalizationMaximum
Namespace Prefix:	rgco_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum debt covenant ratio of priority debt to total assets of a debt instrument.

+ References

No definition available.

+ Details

Name:	rgco_DebtInstrumentDebtCovenantRatioOfPriorityDebtToTotalAssetsMaximum
Namespace Prefix:	rgco_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage amount of the origination fee payable on the debt instrument.

+ References

No definition available.

+ Details

Name:	rgco_DebtInstrumentOriginationFeePercentage
Namespace Prefix:	rgco_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum amount of borrowings allowed for total debt instruments.

+ References

No definition available.

+ Details

Name:	rgco_DebtInstrumentsOverallMaximumBorrowingCapacity
Namespace Prefix:	rgco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for upfront payment.

+ References

No definition available.

+ Details

Name:	rgco_LineOfCreditFacilityUpfrontFeePercentage
Namespace Prefix:	rgco_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

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

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

+ Details

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

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: 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(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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

X

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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

X

- Definition

Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478742/980-340-50-1

+ Details

Name:	us-gaap_RegulatoryAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

+ 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

+ Details

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

X

- Details

Name:	us-gaap_RegulatoryAssetAxis=us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
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_AmendedAndRestatedDelayedTermNoteEnteredSeptember242021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
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_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	srt_StatementScenarioAxis=rgco_VariableRateUponMeetingMilestonesOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=rgco_VariableRateUponMeetingMilestonesTwoMember
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_LongtermDebtTypeAxis=rgco_UnsecuredTermNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: