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Note 8 - Debt (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 23, 2020 | Sep. 23, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 23, 2021 | Aug. 31, 2015
Letters of Credit Outstanding, Amount |  |  |  |  | $ 26,400 | $ 29,700 |  |
Repayments of Lines of Credit |  |  |  |  | $ 695,513 | 1,326,678 |  |
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |
Discontinued Operation, Amount of Continuing Cash Flows after Disposal |  |  |  | $ (35,600) |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  |  | 4.20%
Variable Rate Note [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 28,000
Lenders [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25% |  |  |  |  |  |  |
Percent of Eligible Accounts Receivable | 87.50% |  |  |  | 85.00% |  |  |
Percent of Appraised Net Orderly Liquidation, Value of Eligible Revenue Equipment | 85.00% |  |  |  |  |  |  |
Percent of Net Book Value of Eligible Revenue Equipment | 100.00% |  |  |  | 95.00% |  |  |
Line of Credit Facility, Availability as Percentage of Revolver Commitment | 40.90% |  |  |  | 35.00% |  |  |
Line of Credit Facility, Revolver Commitment, Amount | $ 45,000 |  |  |  |  |  |  |
Line of Credit Facility, Maximum Commitment Value | $ 10,400 |  |  |  |  |  |  |
Percent of Appraised Fair Market Value of Eligible Real Estate | 80.00% |  |  |  | 75.00% |  |  |
Long-term Line of Credit, Total |  |  |  |  | $ 0 |  |  |
Letters of Credit Outstanding, Amount |  |  |  |  | 26,400 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 83,600 |  |  |
Fixed Charge Coverage Requirement |  |  |  |  | 0 | $ 0 |  |
Debt, Secured with a Cross Default Feature |  |  |  |  | $ 4,500 |  |  |
Lenders [Member] | Federal Funds Rate [Member] | Base Rate Loans [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 0.50% |  |  |
Lenders [Member] | London Interbank Offered Rate (LIBOR) [Member] | Base Rate Loans [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.00% |  |  |
Lenders [Member] | Applicable Margin [Member] | Base Rate Loans [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25% |  |  |  | 0.50% |  |  |
Lenders [Member] | Applicable Margin [Member] | Base Rate Loans [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 0.75% |  |  |  | 1.00% |  |  |
Lenders [Member] | Applicable Margin [Member] | LIBOR Loans [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |  |  |  | 1.50% |  |  |
Lenders [Member] | Applicable Margin [Member] | LIBOR Loans [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75% |  |  |  | 2.00% |  |  |
Lenders [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 110,000 |  |  |  | $ 95,000 |  |  |
Line of Credit Facility, Maximum Increase in Borrowing Capacity | 50,000 |  |  |  |  |  |  |
Lenders [Member] | Letter of Credit [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 105,000 |  |  |  | 95,000 |  |  |
Line of Credit Facility, Borrowing Capacity, Percentage of Aggregate Commitments | $ 10,000 |  |  |  |  |  |  |
Lenders [Member] | Swing Line Sub Facility [Member] |  |  |  |  |  |  |  |
Percent of Aggregate Commitments under Credit Facility | 10.00% |  |  |  |  |  |  |
TBK Bank [Member] | Draw Note [Member] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 45,000 |  |  |  |  |  |
Debt Instrument, Collateral Amount |  |  |  |  |  |  | $ 60,000 |
Repayments of Lines of Credit |  |  | $ 31,000 |  |  |  |  |
Long-term Debt, Total |  |  |  |  | $ 0 |  |  |
TBK Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Draw Note [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |  |  |
TBK Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Draw Note [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.25% |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 2: 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 Reference 3: 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 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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