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Note 13 - Indebtedness (Details Textual) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended
	Feb. 01, 2018	Jun. 30, 2020	Apr. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Proceeds from Lines of Credit, Total						$ 5,500	$ 0
Repayments of Lines of Credit						5,500	7,000
Interest Rate Swap [Member]
Derivative, Notional Amount	$ 20,000	$ 12,900		$ 12,900		12,900
Derivative, Term of Contract (Year)	5 years
Derivative, Fixed Interest Rate	2.70%
Interest Rate Swap [Member] | Other Nonoperating Income (Expense) [Member]
Derivative, Gain (Loss) on Derivative, Net, Total				8	$ (198)	(292)	$ (437)
Interest Rate Swap [Member] | Other Current Liabilities [Member]
Derivative, Fair Value, Net, Total		(616)		(616)		(616)		$ (325)
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
Letters of Credit Outstanding, Amount		$ 700		$ 700		$ 700
Debt Instrument, Interest Rate, Effective Percentage		1.16%		1.16%		1.16%
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | Prime Rate [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	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%
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | Unsecured Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000
Proceeds from Lines of Credit, Total			$ 5,500
Repayments of Lines of Credit		$ 5,500
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | Unsecured Term Loan [Member]
Debt Instrument, Face Amount	$ 20,000

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