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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 42 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 08, 2020 USD ($) | Apr. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Sep. 30, 2020 USD ($) $ / shares | Jun. 30, 2020 USD ($) $ / shares | Mar. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) | Apr. 01, 2024 USD ($) | Mar. 21, 2021 USD ($) | Apr. 01, 2020 USD ($)
Number of Reportable Segments |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Insurance Policy Primary Occurence Limit |  |  | $ 9,000 |  |  |  |  |  |  |  | $ 9,000 |  |  |  |  |  |
Insurance Policy Excess Coverage |  |  | 1,000 |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Insurance Policy, Fixed Premium Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500
Proceeds from Divestiture of Businesses |  |  |  |  |  |  |  |  |  |  | 108,375 | $ 0 | $ 0 |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total |  |  |  |  |  |  |  |  |  |  | (40,431) | (0) | (0) |  |  |  |
Contract with Customer, Liability, Revenue Recognized |  |  |  |  |  |  |  |  |  |  | 1,200 | 800 | 1,300 |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total |  |  | 91,300 |  |  |  | $ 81,200 |  |  |  | 91,300 | 81,200 | 97,500 |  |  |  |
Depreciation, Depletion and Amortization, Nonproduction, Total |  |  |  |  |  |  |  |  |  |  | 65,472 | 80,502 | 75,843 |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  | $ (25,663) | $ 7,501 | $ (22,343) | $ (2,213) | $ 1,162 | $ (3,189) | $ 6,071 | $ 4,433 | $ (42,718) | $ 8,477 | $ 42,503 |  |  |  |
Earnings Per Share, Diluted, Total (in dollars per share) | $ / shares |  |  | $ (1.50) | $ 0.43 | $ (1.31) | $ (0.12) | $ 0.06 | $ (0.17) | $ 0.33 | $ 0.24 | $ (2.46) | $ 0.45 | $ 2.30 |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  |  |  |  |  | $ 26,569 | $ 0 | $ 0 |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  |  |  |  |  |  |  | 105 months | 128 months |  |  |  |  |
Workers Compensation Self Insurance Per Claim |  |  |  |  |  |  |  |  |  |  | $ 1,300 |  |  |  |  |  |
Cargo Losses Purchased Coverage per Claim |  |  |  |  |  |  |  |  |  |  | 300 |  |  |  |  |  |
Employee Annual Insuarnce Deductible Per Claim |  |  |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |
Physical Damage Coverage |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Drivers Advances And Other Receivables Net Of Allowance |  |  | $ 13,624 |  |  |  | $ 8,507 |  |  |  | $ 13,624 | $ 8,507 |  |  |  |  |
Liability for Claims and Claims Adjustment Expense, Single Loss Limit |  | $ 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense, Aggregate Limit per Policy Year |  | 18,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense, Aggregate Three Year Limit |  | 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Auto Policy Release Premium Refund |  | $ 14,000 |  |  |  |  |  |  |  |  |  |  |  | $ 7,300 |  |  |
Interest Costs Capitalized |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 100 |  |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 195,000 | 200,000 | 129,000 |  |  |  |
Insurance Policy, Reinstatement Charges |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Employee Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 70,000 |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 70,000 | 0 | 0 |  |  |  |
Receivables from Insurers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drivers Advances And Other Receivables Net Of Allowance |  |  | 0 |  |  |  | 300 |  |  |  | $ 0 | $ 300 |  |  |  |  |
Insurance Settlements Receivable, Current |  |  | 7,400 |  |  |  | 0 |  |  |  | 7,400 | 0 |  |  |  |  |
Insurance Settlements Receivable, Noncurrent |  |  | $ 24,400 |  |  |  | 2,100 |  |  |  | $ 24,400 | $ 2,100 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
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% |  |  |  |  |  |
Revenue Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Capital Leases of Lessee, Term of Contract (Month) |  |  |  |  |  |  |  |  |  |  | 48 months |  |  |  |  |  |
Revenue Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Capital Leases of Lessee, Term of Contract (Month) |  |  |  |  |  |  |  |  |  |  | 84 months |  |  |  |  |  |
Intangible Assets, Amortization Period [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation, Depletion and Amortization, Nonproduction, Total |  |  |  |  |  |  |  |  |  |  | $ 3,200 |  |  |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  | $ (2,500) |  |  |  |  |  |
Earnings Per Share, Diluted, Total (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ (0.14) |  |  |  |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  |  |  | 10 | 10 | 10 |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  | 48.00% | 45.00% | 49.00% |  |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 1 |  |  |  |
Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | $ 103,300 |  | $ 0 |  |  |  | 86,620 |  |  |  | $ 0 | $ 86,620 |  |  |  |  |
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 |  |  |  | 28,100 |  |  |  | 28,100 | 28,100 | $ 17,300 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total | $ 3,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Contingent Liabilities |  |  | 44,151 |  |  |  | $ 0 |  |  |  | 44,151 | $ 0 |  |  |  |  |
Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group Including Discontinued Operation, Total Indemnification |  |  | 44,200 |  |  |  |  |  |  |  | 44,200 |  |  |  |  |  |
Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group Including Discontinued Operation, Total Indemnification |  |  | $ 45,000 |  |  |  |  |  |  |  | $ 45,000 |  |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance Policy Primary Occurence Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000 | $ 9,000 |
Insurance Policy Excess Coverage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 | $ 1,000 |
Transport Enterprise Leasing LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 49.00% |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |

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