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Capital Notes (Narrative) (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Dec. 29, 2021 | Sep. 24, 2020 | Mar. 31, 2022 | Apr. 13, 2020
Pettyjohn, Wood & White, Inc [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of capital stock purchased |  |  | 100.00% |
National Bank of Blacksburg (NBB Note) [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital notes, interest rate | 4.00% |  |  |
Proceeds from Issuance of Debt | $ 11,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |  |
Debt instrument amortization period |  |  | 15 years |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid | $ 9,375,000 |  |  |
Percentage of common stock secured by first priority lien |  |  | 4.95% |
Capital Notes 4% Due 1/24/2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital notes, interest rate |  |  | 4.00% |
Proceeds used to pay off debt |  | $ 5,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% |
Capital Notes 3.25% Due 09/30/2025 [Member] | 2020 Offering [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Capital notes, interest rate |  |  | 3.25% |
Capital notes, maturity date |  |  | Jun. 30, 2025 |
Principal notes |  |  |  | $ 10,050,000
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.25% |

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