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Capital Notes (Narrative) (Details) - USD ($) |  | 9 Months Ended |
--- | --- | --- | ---
Sep. 24, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Apr. 13, 2020
Debt Instrument [Line Items] |  |  |  |
Proceeds used to pay off debt |  |  | $ 5,000,000 |
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 |  |  |
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 |  | Sep. 30, 2025 |  |
Principal notes |  |  |  | $ 10,050,000
Full or partial payment date |  | Sep. 30, 2021 |  |

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