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Note 9 - Long-term Debt (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Mar. 31, 2021	Dec. 22, 2020
Debt Issuance Costs, Net, Total	$ 1,259		$ 1,259		$ 1,393
The Credit Agreement [Member]
Debt Issuance Costs, Net, Total							$ 1,400
Line of Credit Facility, Interest Rate During Period	3.40%	9.80%	3.30%	9.60%
Debt Instrument, Quarterly Payment, Current Year						$ 500
Debt Instrument Quarterly Payment Next Eight Years						750
Debt Instrument, Quarterly Payment, Thereafter						$ 1,000
Percentage of Consolidated Excess Cash Flow						50.00%
Debt, Weighted Average Interest Rate	3.00%		3.00%
The Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Interest Rate, State Floor Percentage					0.50%
The Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate					3.25%
The Credit Agreement [Member] | Base Rate [Member]
Debt Instrument, Interest Rate, State Floor Percentage					1.00%
The Credit Agreement [Member] | The ABR Loan [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate					1.50%
The Credit Agreement [Member] | The ABR Loan [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate					3.00%
The Credit Agreement [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Remaining Borrowing Capacity	$ 19,600		$ 19,600
Term Loan [Member]
Long-term Debt, Gross	$ 39,000		$ 39,000		$ 40,000
The LIBOR Loan and Pricing Grid Credit Agreement [Member] | The Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate					2.00%
The Lenders [Member] | The Credit Agreement [Member] | Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity							10,000
The Lenders [Member] | The Credit Agreement [Member] | Swingline Loan Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity							10,000
The Lenders [Member] | Term Loan [Member] | The Credit Agreement [Member]
Long-term Debt, Gross							40,000
Line of Credit Facility, Maximum Borrowing Capacity							$ 25,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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