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Note 7 - Long-term Debt - Long-term Debt (Details) - USD ($)	Mar. 31, 2024	Sep. 30, 2023
Unamortized Debt Issuance Costs	$ 258,113	$ 255,272
Total long-term debt, net current maturities	136,175,000	126,100,000
Notes Payable [Member]
Notes payable	136,300,000	137,075,000
Unamortized Debt Issuance Costs	258,113	255,272
Less: current maturities of long-term debt	(125,000)	(10,975,000)
Total long-term debt, net current maturities	136,175,000	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	101,368	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	16,856	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	21,928	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	20,256	22,017
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]
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	30,300	33,666
RGC Midstream LLC [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term notes payable, at TERM SOFR plus 2.00%, due December 31, 2024 [Member]
Notes payable	23,275,000	23,000,000
Unamortized Debt Issuance Costs	45,218	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	5,417	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	9,125,000	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	$ 16,770

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