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Debt (Narrative) (Details) - USD ($) |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 04, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Aug. 05, 2021
Debt |  |  |  |
Proceeds from borrowing under lines of credit |  | $ 1,072,000 |  |
Credit Agreement | Capital One, N.A. |  |  |  |
Debt |  |  |  |
Maximum borrowing capacity | $ 140,000,000.0 |  |  |
Credit Agreement | Capital One, N.A. | In the first two years |  |  |  |
Debt |  |  |  |
Debt Instrument, Annual Principal Payment | 1,800,000 |  |  |
Credit Agreement | Capital One, N.A. | Starting in the third year |  |  |  |
Debt |  |  |  |
Debt Instrument, Annual Principal Payment | 3,500,000 |  |  |
Credit Agreement | Capital One, N.A. | Starting in the fifth year |  |  |  |
Debt |  |  |  |
Debt Instrument, Annual Principal Payment | 3,900,000 |  |  |
Credit Agreement | Capital One, N.A. | Interest rate swaps |  |  |  |
Debt |  |  |  |
Notional Amount |  |  |  | $ 55,000,000.0
Interest rate swap, fair value |  |  |  | $ 0.93
Term Loan | Capital One, N.A. |  |  |  |
Debt |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 1.84% |
Borrowings | 70,000,000.0 |  |  |
Loan issuance costs |  |  | $ 1,400,000 |
Revolving Credit Facility | Capital One, N.A. |  |  |  |
Debt |  |  |  |
Maximum borrowing capacity | $ 70,000,000.0 |  |  |
Minimum | Term Loan | Capital One, N.A. | LIBOR |  |  |  |
Debt |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.50% |  |  |
Maximum | Term Loan | Capital One, N.A. | LIBOR |  |  |  |
Debt |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.50% |  |  |

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