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Note 9 - Long-term Debt (Details Textual) |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2023 | Jun. 28, 2023 USD ($) | Mar. 24, 2023 USD ($) | Jun. 30, 2022 | Dec. 31, 2023 USD ($) | Jun. 30, 2023 | Sep. 30, 2023 USD ($) | Apr. 03, 2023 USD ($) | Aug. 20, 2021 USD ($)
Regulatory Asset |  |  |  |  | $ 8,218,209 |  | $ 8,243,721 |  |
Debt Instrument, Debt Covenant Ratio of Long-term Debt to Total Capitalization, Maximum |  |  |  |  | 65.00% |  |  |  |
Debt Instrument, Debt Covenant, Ratio of Priority Debt to Total Assets, Maximum |  |  |  |  | 15.00% |  |  |  |
Debt Instrument, Debt Covenant, Interest Coverage Ratio |  |  |  |  |  | 1.5 |  |  |
Deferred Gain (Loss) on Early Extinguishment of Debt [Member] |  |  |  |  |  |  |  |  |
Regulatory Asset |  |  |  |  | $ 1,227,512 |  | $ 1,256,059 |  |
Regulatory Asset, Amortization Period (Year) |  |  |  |  | 20 years |  |  |  |
Amended and Restated Delayed Term Note Entered September 24, 2021 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 10,000,000 |
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 15,000,000
RGC Midstream LLC [Member] |  |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  | 2.49% |
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |  |  | 1.50% |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured term note payable, at Daily Simple SOFR plus 1.26448%, due June 12, 2026[Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 14,000,000 |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  | 3.24% |  |  |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 8,000,000 |  |  | $ 8,000,000 |  |  |  |
Derivative, Fixed Interest Rate |  | 2.443% |  |  | 2.443% |  |  |  |
RGC Midstream LLC [Member] | Unsecured Debt [Member] | London Interbank Offered Rate (LIBOR) 1 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.15% |  |  |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Debt [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.26448% |  |  |  |  |  |  |
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 10,000,000 |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |  |  |  |  |
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |  |  |  |  |
Roanoke Gas Company [Member] | Unsecured Debt [Member] | Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 15,000,000 |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  | 2.00% |  |  |  |

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