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Note 13 - Indebtedness (Details Textual) - USD ($) $ in Thousands			3 Months Ended
	Dec. 31, 2020	Feb. 01, 2018	Mar. 31, 2021	Mar. 31, 2020
Interest Rate Swap [Member]
Derivative, Notional Amount		$ 20,000	$ 10,700
Derivative, Term of Contract (Year)		5 years
Derivative, Fixed Interest Rate		2.70%
Derivative, Fair Value, Net, Total			(385)	$ (624)
Interest Rate Swap [Member] | Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total			10	$ 327
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
Debt Instrument, Interest Rate, Effective Percentage	1.11%			1.11%
Letters of Credit Outstanding, Amount	$ 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

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