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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Apr. 01, 2024 USD ($) | Dec. 01, 2022 USD ($)
Number of Reportable Segments |  | 4 |  |  |  |
Insurance Policy Primary Occurence Limit | $ 9,000 | $ 9,000 | $ 7,000 |  |  |
Insurance Policy Excess Coverage | 1,000 | 1,000 | 3,000 |  |  |
Insurance Policy Excess Coverage | 1,000 | 1,000 | 3,000 |  |  |
Contract with Customer, Liability, Revenue Recognized |  | 1,100 | $ 1,400 | $ 400 |  |
Accounts Receivable, after Allowance for Credit Loss | 142,500 | 142,500 |  |  |  | $ 119,800
Cash, Uninsured Amount | $ 1,500 | $ 1,500 |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 151 months | 151 months | 138 months |  |  |
Accrued Liabilities | $ 59,100 | $ 59,100 | $ 59,100 |  |  |
Employee-related Liabilities | 25,900 | 25,900 | 24,600 |  |  |
Accrued Purchased Transportation | 8,400 | 8,400 | 7,800 |  |  |
Workers Compensation Self Insurance Per Claim |  | 1,500 |  |  |  |
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 | 4,367 | $ 4,367 | 3,798 |  |  |
Interest Costs Capitalized |  | $ 300 | $ 300 | $ 100 |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures (in shares) | shares |  | 245,000 | 358,000 | 217,000 |  |
Restricted Stock [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  | 0 |  |  |  |
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares) | shares |  | 541,000 |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture (in shares) | shares |  |  | 161,000 |  |  |
Employee Stock Options [Member] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  | 0 | 104 | 124,000 |  |
Receivables from Insurers [Member] |  |  |  |  |  |
Drivers Advances and Other Receivables Net Of Allowance | 800 | $ 800 | $ 0 |  |  |
Insurance Settlements Receivable, Current | 0 | 0 | 700 |  |  |
Insurance Settlements Receivable, Noncurrent | $ 1,300 | $ 1,300 | $ 0 |  |  |
Maximum [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 17 years | 17 years |  |  |  |
Minimum [Member] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) | 3 years | 3 years |  |  |  |
Tractors [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years | 5 years |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage | 0.00% | 0.00% |  |  |  |
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 | 7 years |  |  |  |
Dry Van Trailers [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 10 years | 10 years |  |  |  |
Dry Van Trailers [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage | 25.00% | 25.00% |  |  |  |
Dry Van Trailers [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage | 28.00% | 28.00% |  |  |  |
Revenue Equipment [Member] | Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 20 years | 20 years |  |  |  |
Capital Leases of Lessee, Term of Contract (Month) |  | 84 months |  |  |  |
Revenue Equipment [Member] | Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 2 years | 2 years |  |  |  |
Capital Leases of Lessee, Term of Contract (Month) |  | 48 months |  |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |
Number of Major Customers | 10,000,000 |  |  |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Ten Customers [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 44.00% | 43.00% | 53.00% |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |  |  |  |
Number of Major Customers |  | 1 | 0 |  |  |
Forecast [Member] |  |  |  |  |  |
Insurance Policy Primary Occurence Limit |  |  |  |  | $ 7,000 |
Insurance Policy Excess Coverage |  |  |  |  | 3,000 |
Insurance Policy Excess Coverage |  |  |  |  | $ 3,000 |
Transport Enterprise Leasing LLC [Member] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 49.00% | 49.00% | 49.00% |  |  |

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