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Long-Term Debt (Narrative) (Details) - USD ($) |  |  |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 27, 2021 | Jun. 27, 2018 | Aug. 15, 2015 | Aug. 18, 2015 | Sep. 30, 2021 | Nov. 02, 2021 | Dec. 31, 2020 | Jul. 01, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  | $ 10,000,000 |
Credit Facility Participation Fee And Fronting Fee Percentage |  |  |  |  | 0.25% |  |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, interest rate at period end |  |  |  |  | 0.125% |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 100,000,000 |  |  |  | $ 70,000,000
Debt Instrument, Maturity Date |  | Jun. 27, 2023 |  | Aug. 18, 2020 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | $ 60,000,000 |  |  |
Amortization of debt issuance costs |  |  |  |  | $ 266,000 |  |  |
Debt instrument, term |  |  | 5 years |  |  |  |  |
Debt Instrument Term Post Extension |  | 5 years |  |  |  |  |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 50,000,000 |  |  |  |  | $ 50,000,000 |  |
Repayments of Long-term Lines of Credit | $ 10,000,000 |  |  |  |  |  |  |
Minimum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 0.00% |  |  |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.00% |  |  |
Minimum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  | 0.20% |  |  |
Maximum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.00% |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.00% |  |  |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  |  | 0.30% |  |  |
Second Amendment [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  |  |  | $ 120,000 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  | $ 10,000,000 |  | $ 10,000,000 |

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