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Note 9 - Long Term Debt (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 22, 2020
Debt Issuance Costs, Net, Total	$ 1,330		$ 1,393
The Credit Agreement [Member]
Debt Issuance Costs, Net, Total				$ 1,400
Debt, Weighted Average Interest Rate	3.25%
Line of Credit Facility, Interest Rate During Period	3.30%	9.40%
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%
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
Term Loan [Member]
Long-term Debt, Gross	$ 39,500		$ 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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