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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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- Definition

Amount of the total principal payments made during the annual reporting period.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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