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Note 7 - Long-Term Debt - Long-Term Debt (Details) (Parentheticals) - USD ($)					3 Months Ended	12 Months Ended
	Nov. 01, 2024	May 02, 2024	Mar. 06, 2024	Jul. 28, 2023	Dec. 31, 2024	Sep. 30, 2024
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]	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 Note Payable, at 30-day SOFR Plus 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] | Revolving Credit Facility, at Daily Simple SOFR plus 2.215%, due May 2, 2026 [Member | Revolving Credit Facility [Member]
Debt Instrument, Basis Spread on Variable Rate					2.215%	2.215%
RGC Midstream LLC [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term note payable at Term SOFR plus 1.75%, due December 31, 2025 [Member]
Debt Instrument, Basis Spread on Variable Rate	1.55%				1.75%	1.75%
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					2.44%	2.44%
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

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+ References

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+ 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
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-Publisher FASB
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-Section S99
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-SubTopic 10
-Topic 210
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 470
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-Section 50
-Paragraph 3
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