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Note 1 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 08, 2020 | Oct. 31, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 23, 2020
Proceeds from Divestiture of Businesses |  |  |  |  |  |  |  | $ 0 | $ 108,375 |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total |  |  |  |  |  |  |  | (0) | 3,720 |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax, Total |  |  |  |  |  |  |  | 3,412 | (0) |
Repayments of Lines of Credit |  |  |  |  |  |  |  | 585,838 | 1,091,966 |
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent |  |  | $ 5,100 |  |  | $ 44,151 |  | $ 5,100 |  |
Tractors [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  |  |  |  |  | 5 years |  |
Tractors [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage |  |  | 10.00% |  |  |  |  | 10.00% |  |
Tractors [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage |  |  | 35.00% |  |  |  |  | 35.00% |  |
Refrigerated Trailers [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  |  |  |  |  | 7 years |  |
Dry Van Trailers [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  |  |  |  |  | 10 years |  |
Dry Van Trailers [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage |  |  | 28.00% |  |  |  |  | 28.00% |  |
Dry Van Trailers [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage |  |  | 21.00% |  |  |  |  | 21.00% |  |
TBK Bank [Member] | Draw Note [Member] |  |  |  |  |  |  |  |  |  |
Repayments of Lines of Credit |  |  |  | $ 31,000 |  |  |  |  |  |
Long-term Debt, Total |  |  | $ 0 |  |  |  |  | $ 0 |  |
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | $ 103,300 |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration | 122,300 |  |  |  |  |  |  |  |  | $ 108,400
Proceeds from Divestiture of Businesses | 108,400 |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration, Equity Interest Acquired | 13,900 |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Earnout Opportuntiy, Maximum | 9,900 |  |  |  |  |  |  |  |  |
Disposal Group Including Discontinued Operation, Dispute over Nature of Assets | 66,000 |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration Returned upon Settlement |  | $ 28,100 |  |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total |  | $ 3,700 |  |  |  |  |  |  |  |
Disposal Group Including Discontinued Operation, Assets Advances Against Future Payments For Services Not Yet Performed | 62,000 |  |  |  |  |  |  |  |  |
Disposal Group Including Discontinued Operation, Indemnity, Loss Amount | $ 30,000 |  |  |  |  |  |  |  |  |
Disposal Group Including Discontinued Operation, Indemnity, Percentage of Next 30 Million Loss | 50.00% |  |  |  |  |  |  |  |  |
Disposal Group Including Discontinued Operation, Total Indemnification | $ 45,000 |  |  |  |  | 44,200 |  |  |  |
Discontinued Operation, Amount of Continuing Cash Flows after Disposal |  |  |  |  | $ 35,600 | $ (35,600) |  |  |  |
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax, Total |  |  | (0) |  | $ 3,400 |  | $ (0) | 3,412 | $ (0) |
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent |  |  | $ 5,100 |  |  |  |  | $ 5,100 |  |

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