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Note 7 - Long-term Debt - Long-term Debt (Details) - USD ($)	Jun. 30, 2024	Sep. 30, 2023
Notes payable	$ 137,015,000	$ 137,075,000
Unamortized Debt Issuance Costs	303,652	255,272
Revolving credit facility at Daily Simple SOFR plus 2.215%, due May 2, 2026	7,615,825
Less: current maturities of long-term debt	(400,000)	(10,975,000)
Total long-term debt, net current maturities	136,615,000	126,100,000
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Senior Notes Payable, at 4.26%, Due on September 18, 2034 [Member]
Notes payable	30,500,000	30,500,000
Unamortized Debt Issuance Costs	98,954	106,195
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 3.58%, Due on October 2, 2027 [Member]
Notes payable	8,000,000	8,000,000
Unamortized Debt Issuance Costs	15,652	19,264
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 4.41 %, Due on March 28, 2031 [Member]
Notes payable	10,000,000	10,000,000
Unamortized Debt Issuance Costs	21,145	23,495
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 3.60%, Due on December 6, 2029 [Member]
Notes payable	10,000,000	10,000,000
Unamortized Debt Issuance Costs	19,375	22,017
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]
Notes payable	15,000,000	15,000,000
Unamortized Debt Issuance Costs	0	0
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term note payable, at Term SOFR plus 1.00%, due October 1, 2028 [Member]
Notes payable	10,000,000	10,000,000
Unamortized Debt Issuance Costs	28,784	33,666
RGC Midstream LLC [Member] | Revolving Credit Facility, at Daily Simple SOFR plus 2.215%, due May 2, 2026 [Member | Revolving Credit Facility [Member]
Unamortized Debt Issuance Costs	53,087	0
Revolving credit facility at Daily Simple SOFR plus 2.215%, due May 2, 2026	9,000,000	0
RGC Midstream LLC [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term note payable at Term SOFR plus 1.75%, due December 31, 2025 [Member]
Notes payable	24,115,000	23,000,000
Unamortized Debt Issuance Costs	38,758	23,386
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]
Notes payable	14,000,000	14,000,000
Unamortized Debt Issuance Costs	4,815	6,621
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]
Notes payable	0	9,375,000
Unamortized Debt Issuance Costs	0	1,571
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]
Notes payable	6,400,000	7,200,000
Unamortized Debt Issuance Costs	$ 23,082	$ 19,057

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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