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Note 9 - Long-term Debt - Long-term Debt (Details) - USD ($) | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Unamortized Debt Issuance Costs | $ 238,804 | $ 255,272
Total long-term debt, net current maturities | 102,700,000 | 126,100,000
Notes Payable [Member] |  |
Notes payable | 136,550,000 | 137,075,000
Unamortized Debt Issuance Costs | 238,804 | 255,272
Less: current maturities of long-term debt | (33,850,000) | (10,975,000)
Total long-term debt, net current maturities | 102,700,000 | 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 | 103,782 | 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 | 18,060 | 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 | 22,711 | 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 | 21,136 | 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 | 31,983 | 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 | 23,000,000 | 23,000,000
Unamortized Debt Issuance Costs | 16,217 | 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 | 6,019 | 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 | 9,250,000 | 9,375,000
Unamortized Debt Issuance Costs | 982 | 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 | 6,800,000 | 7,200,000
Unamortized Debt Issuance Costs | $ 17,914 | $ 19,057

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