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Note 7 - Long-term Debt (Details Textual) - USD ($) |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 02, 2024 | Mar. 06, 2024 | Jul. 31, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025 | May 29, 2024 | Apr. 03, 2023 | Aug. 20, 2021
Debt Instruments, Overall Maximum Borrowing Capacity |  | $ 25,000,000 |  |  |  |  |  |  |
Unsecured Debt |  |  |  | $ 137,500,000 | $ 137,755,000 |  |  |  |
Regulatory Asset |  |  |  | $ 5,936,982 | 9,548,954 |  |  |  |
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 |  |  |  |  |
Long-Term Debt, Current Maturities |  |  |  | $ 2,534,514 | $ 800,000 |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) [Member] | Secured Overnight Financing Rate (SOFR) [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |
Deferred Gain (Loss) on Early Extinguishment of Debt [Member] |  |  |  |  |  |  |  |  |
Regulatory Asset |  |  |  | 1,056,231 | $ 1,141,872 |  |  |  |
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 |  |  |  |  |
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  | $ 15,000,000
Amended and Restated Delayed Term Note Entered September 24, 2021 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 10,000,000 |
Subsequent Letter of Commitment to Refinance [Member] |  |  |  |  |  |  |  |  |
Long-Term Debt, Current Maturities |  |  |  | $ 2,500,000 |  |  |  |  |
Subsequent Letter of Commitment to Refinance [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.55% |  |  |  |  |  |
Unsecured Debt |  |  | $ 53,600,000 |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  | 7 years |  |  |  |  |  |
Debt Instrument, Origination Fee, Percentage |  |  | 0.30% |  |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 8,000,000 |  | $ 8,000,000 |  |  |  |  |
RGC Midstream LLC [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.215% |  |  |  |  |  |  |  |
Line of Credit Facility, Upfront Fee Percentage | 0.40% |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.125% |  |  |  |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Promissory Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |  |  |  |  |  |  |
RGC Midstream LLC [Member] | Unsecured Promissory Notes [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] | 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 |  |

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