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Note 7 - Long-term Debt - Long-term Debt (Details) - USD ($) | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Unamortized Debt Issuance Costs | $ 255,272 | $ 275,911
Notes Payable [Member] |  |
Notes payable | 137,075,000 | 137,271,200
Unamortized Debt Issuance Costs | 255,272 | 275,911
Less: current maturities of long-term debt | (10,975,000) | (1,300,000)
Total long-term debt, net current maturities | 126,100,000 | 135,971,200
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 | 106,195 | 115,849
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 | 19,264 | 24,080
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 | 23,495 | 26,627
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 | 22,017 | 25,539
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 | 33,666 | 28,674
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 | 21,896,200
Unamortized Debt Issuance Costs | 23,386 | 18,553
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 | 6,621 | 9,029
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 | 9,375,000 | 9,875,000
Unamortized Debt Issuance Costs | 1,571 | 3,929
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 | 7,200,000 | 8,000,000
Unamortized Debt Issuance Costs | $ 19,057 | $ 23,631

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