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Note 7 - Long-term Debt - Long-term Debt (Details) (Parentheticals) - USD ($) | 6 Months Ended | 12 Months Ended |
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Mar. 31, 2024 | Sep. 30, 2023 | Apr. 03, 2023
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) [Member] | Secured Overnight Financing Rate (SOFR) [Member] |
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Senior Notes Payable, at 4.26%, Due on September 18, 2034 [Member] |  |  |
Stated rate | 4.26% | 4.26% |
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 3.58%, Due on October 2, 2027 [Member] |  |  |
Stated rate | 3.58% | 3.58% |
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 4.41 %, Due on March 28, 2031 [Member] |  |  |
Stated rate | 4.41% | 4.41% |
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured Term Notes Payable, at 3.60%, Due on December 6, 2029 [Member] |  |  |
Stated rate | 3.60% | 3.60% |
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] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.20% | 1.20% |
Derivative, Fixed Interest Rate | 2.00% | 2.00% |
Roanoke Gas Company [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term note payable, at Term SOFR plus 1.00%, due October 1, 2028 [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.00% | 1.00% |
Derivative, Fixed Interest Rate | 2.49% | 2.49% |
RGC Midstream LLC [Member] |  |  |
Derivative, Fixed Interest Rate |  |  | 2.49%
RGC Midstream LLC [Member] | Unsecured Senior Notes Payable [Member] | Unsecured term notes payable, at TERM SOFR plus 2.00%, due December 31, 2024 [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% | 2.00% |
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] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.26448% | 1.26448% |
Derivative, Fixed Interest Rate | 3.24% | 3.24% |
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] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.20% | 1.20% |
Derivative, Fixed Interest Rate | 3.14% | 3.14% |
Debt Instrument, Periodic Payment | $ 41,667 | $ 41,667 |
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] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.26448% | 1.26448% |
Derivative, Fixed Interest Rate | 2.443% | 2.443% |
Debt Instrument, Periodic Payment | $ 400,000 | $ 400,000 |

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