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v3.20.1

Derivatives and Hedging (Details) | Mar. 31, 2020 USD ($) instrument_held debt_instrument | Jun. 13, 2019 USD ($) | Jun. 12, 2019 USD ($) instrument_held
--- | --- | --- | ---
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Number of interest rate swaps associated with note(s) | instrument_held | 3 |  |
Roanoke Gas Company [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 0.90%, due November 1, 2021 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Debt instrument, borrowing amount | $ 7,000,000 |  |
Effective interest rate | 2.30% |  |
RGC Midstream LLC [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Number of interest rate swaps associated with note(s) | instrument_held | 2 |  |
Debt instrument, number of instruments | 2 |  | 2
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.15%, due June 12, 2026 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Debt instrument, borrowing amount | $ 14,000,000 |  | $ 14,000,000
Effective interest rate | 3.24% |  | 3.24%
RGC Midstream LLC [Member] | Unsecured Term Notes [Member] | Unsecured Term Notes Payable, at 30-day LIBOR plus 1.20%, due June 1, 2024 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Debt instrument, borrowing amount | $ 10,000,000 | $ 10,000,000 |
Effective interest rate | 3.14% | 3.14% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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