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v3.20.1

Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 26, 2020 | Dec. 23, 2019 | Mar. 31, 2020 | Dec. 06, 2019 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | $ 112,575,200 |  | $ 95,512,200
Principal |  |  | 112,575,200 |  | 103,684,673
Unamortized Debt Issuance Costs |  |  | 343,551 |  | 313,315
Notes Payable [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | 112,575,200 |  | 95,512,200
Unamortized Debt Issuance Costs |  |  | 343,551 |  | 313,315
Roanoke Gas Company [Member] | Unsecured Senior Notes [Member] | Unsecured Senior Notes Payable, at 4.26%, due on September 18, 2034 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | 30,500,000 |  | 30,500,000
Unamortized Debt Issuance Costs |  |  | $ 139,984 |  | 144,811
Stated percentage rate |  |  | 4.26% |  |
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 0.90%, due November 1, 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | $ 7,000,000 |  | 7,000,000
Unamortized Debt Issuance Costs |  |  | $ 5,280 |  | 6,948
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 0.90%, due November 1, 2021 [Member] | 30-day LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate basis points (as a percent) |  |  | 0.90% |  |
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 3.58%, due October 2, 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | $ 8,000,000 |  | 8,000,000
Unamortized Debt Issuance Costs |  |  | $ 36,120 |  | 38,528
Stated percentage rate |  |  | 3.58% |  |
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 4.41%, due March 28, 2031 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | $ 10,000,000 |  | 10,000,000
Unamortized Debt Issuance Costs |  |  | $ 34,459 |  | 36,272
Stated percentage rate |  |  | 4.41% |  |
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 3.60%, due December 6, 2029 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | $ 10,000,000 |  | 0
Unamortized Debt Issuance Costs |  |  | $ 34,346 |  | 0
Stated percentage rate |  |  | 3.60% | 3.60% |
Roanoke Gas Company [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR plus 1.00%, due March 31, 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line-of-credit |  |  | $ 0 |  | 8,172,473
Unamortized Debt Issuance Costs |  |  | $ 0 |  | 0
Roanoke Gas Company [Member] | Line of Credit [Member] | Line of Credit, at 30-day LIBOR plus 1.00%, due March 31, 2022 [Member] | 30-day LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate basis points (as a percent) | 1.00% |  | 1.00% |  |
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.35%, due December 29, 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | $ 23,075,200 |  | 16,012,200
Unamortized Debt Issuance Costs |  |  | $ 68,492 |  | 59,504
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.35%, due December 29, 2022 [Member] | 30-day LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate basis points (as a percent) |  | 1.35% | 1.35% |  |
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.15%, due June 12, 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | $ 14,000,000 |  | 14,000,000
Unamortized Debt Issuance Costs |  |  | $ 15,048 |  | 16,252
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.15%, due June 12, 2026 [Member] | 30-day LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate basis points (as a percent) |  |  | 1.15% |  |
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.20%, due June 1, 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes payable |  |  | $ 10,000,000 |  | 10,000,000
Unamortized Debt Issuance Costs |  |  | $ 9,822 |  | $ 11,000
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.20%, due June 1, 2024 [Member] | 30-day LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable rate basis points (as a percent) |  |  | 1.20% |  |

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