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Note 7 - Long-term Debt (Details Textual) |  |  |  |  |  | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 02, 2024 USD ($) | Mar. 06, 2024 USD ($) | Jul. 28, 2023 | Jun. 28, 2023 USD ($) | Mar. 24, 2023 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Apr. 03, 2023 USD ($) | Aug. 20, 2021 USD ($)
Debt Instruments, Overall Maximum Borrowing Capacity |  | $ 25,000,000 |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  | $ 137,015,000 | $ 137,075,000 |  |
Regulatory Asset |  |  |  |  |  |  | $ 8,795,500 | 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 |  |  |  |  |  |  | $ 1,170,418 | $ 1,256,059 |  |
Regulatory Asset, Amortization Period (Year) |  |  |  |  |  | 20 years |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 9,000,000 |  |  |  |  |  | $ 9,000,000 |  |  |
Debt Instrument, Debt Covenant, Interest Coverage Ratio |  |  |  |  |  |  | 1.5 |  |  |
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 Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 8,000,000 |  |  | $ 8,000,000 |  |  |
Derivative, Fixed Interest Rate |  |  |  | 2.443% |  |  | 2.443% |  |  |
RGC Midstream LLC [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Upfront Fee Percentage | 0.40% |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.125% |  |  |  |  |  |  |  |  |
RGC Midstream LLC [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.26448% |  |  |  |  |  |
RGC Midstream LLC [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.215% |  |  |  |  |  |  |  |  |
RGC Midstream LLC [Member] | London Interbank Offered Rate (LIBOR) 1 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.15% |  |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% | 2.00% |  |  |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Variable Rate Upon Meeting Milestones One [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.75% |  |  |  |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Variable Rate Upon Meeting Milestones Two [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.55% |  |  |  |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Term Note Payable, at 30-day LIBOR Plus 1.20%, Due June 1, 2024 [Member] | Unsecured Term Notes [Member] |  |  |  |  |  |  |  |  |  |
Unsecured Debt |  |  |  |  |  | $ 9,000,000 |  |  |  |
RGC Midstream LLC [Member] | Unsecured term note payable, at Daily Simple SOFR plus 1.26448%, due June 12, 2026[Member] | Unsecured Term Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 14,000,000 |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  | 3.24% |  |  |  |  |  |
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.00% |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 10,000,000 |  |  |  |  |
Roanoke Gas Company [Member] | Amended and Restated Delayed Term Note Entered September 24, 2021 [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.00% |  |  |  |  |
Roanoke Gas Company [Member] | Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 15,000,000 |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  | 2.00% |  |  |

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