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Note 9 - Long-term Debt (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Mar. 31, 2021 | Dec. 22, 2020
Debt Issuance Costs, Net, Total | $ 1,190 |  | $ 1,190 |  | $ 1,393 |  |
The Credit Agreement [Member] |  |  |  |  |  |  |
Debt Issuance Costs, Net, Total |  |  |  |  |  |  | $ 1,400
Debt, Weighted Average Interest Rate | 3.00% |  | 3.00% |  |  |  |
Line of Credit Facility, Interest Rate During Period | 3.20% | 10.10% | 3.30% | 9.80% |  |  |
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 | $ 17,100 |  | $ 17,100 |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |
Long-term Debt, Gross | $ 38,500 |  | $ 38,500 |  | $ 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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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