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Note 7 - Long-term Debt - Long-term Debt (Details) - USD ($)	Jun. 30, 2025	Sep. 30, 2024
Notes payable	$ 137,500,000	$ 137,755,000
Unamortized Debt Issuance Costs	213,624	282,092
Revolving credit facility at Daily Simple SOFR plus 2.215%, due May 2, 2026	4,991,528
Less: current maturities of long-term debt	(2,534,514)	(800,000)
Total long-term debt, net current maturities	134,965,486	136,955,000
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable, at 4.26%, Due on September 18, 2034 [Member]
Unamortized Debt Issuance Costs		96,541
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	89,300
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	10,836	14,448
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	18,013	20,362
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	15,852	18,494
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	23,031	27,044
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	24,887	47,285
Revolving credit facility at Daily Simple SOFR plus 2.215%, due May 2, 2026	9,000,000	9,000,000
RGC Midstream LLC [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term note payable at Term SOFR plus 1.55%, due December 31, 2025 [Member]
Notes payable	25,000,000	24,855,000
Unamortized Debt Issuance Costs	12,919	32,299
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	2,408	4,213
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	6,000,000	6,400,000
Unamortized Debt Issuance Costs	$ 16,378	$ 21,406

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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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