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Note 13 - Indebtedness (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Feb. 01, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Interest Rate Swap [Member]            
Derivative, Notional Amount $ 20,000 $ 12,100   $ 12,100    
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   0 $ (24) (362) $ (461)  
Interest Rate Swap [Member] | Other Current Liabilities [Member]            
Derivative, Fair Value, Net, Total   (538)   (538)   $ (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    
Debt Instrument, Interest Rate, Effective Percentage   1.14%   1.14%    
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] | 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