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Note 12 - Indebtedness (Details Textual) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Feb. 01, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Interest Rate Swap [Member]
Derivative, Notional Amount	$ 20,000	$ 15,000		$ 15,000
Derivative, Term of Contract	5 years
Derivative, Fixed Interest Rate	2.70%
Interest Rate Swap [Member] | Other Nonoperating Income (Expense) [Member]
Derivative, Loss on Derivative		24	$ 85	461	$ 137
Interest Rate Swap [Member] | Other Current Liabilities [Member]
Derivative, Fair Value, Net, Total		397		397		$ 64
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
Debt Instrument, Interest Rate, Effective Percentage		3.00%		3.00%
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
Subsidiary Guarantors [Member] | Amended and Restated Credit Agreement [Member] | Unsecured Term Loan [Member]
Debt Instrument, Face Amount	$ 20,000

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