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

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Fixed interest rate related to the interest rate derivative.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Nominal or face amount used to calculate payment on derivative.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Note 13 - Indebtedness (Details Textual) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Dec. 31, 2020	Feb. 01, 2018	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest Rate Swap [Member]
Derivative, Notional Amount		$ 20,000	$ 10,000		$ 10,000
Derivative, Term of Contract (Year)		5 years
Derivative, Fixed Interest Rate		2.70%
Derivative, Fair Value, Net, Total	$ (465)		(321)		(321)
Interest Rate Swap [Member] \| Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total			64	$ 8	144	$ 292
Subsidiary Guarantors [Member] \| Unsecured Revolving Credit Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate		1.00%
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member]
Debt Instrument, Face Amount		$ 70,000
Long-term Debt, Total	0		$ 0		$ 0
Debt Instrument, Interest Rate, Effective Percentage			1.09%		1.09%
Letters of Credit Outstanding, Amount	700		$ 700		$ 700
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| Unsecured Term Loan [Member]
Debt Instrument, Face Amount	$ 20,000
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%	1.50%
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| Prime Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.00%	0.00%
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| Prime Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.25%	0.25%
Subsidiary Guarantors [Member] \| Amended and Restated Credit Agreement [Member] \| Unsecured Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000