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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Apr. 01, 2024 USD ($)
Number of Reportable Segments |  | 4 |  |  |
Insurance Policy Primary Occurence Limit | $ 7,000 | $ 7,000 | $ 9,000 |  | $ 7,000
Insurance Policy Excess Coverage | 3,000 | 3,000 | 1,000 |  | 3,000
Insurance Policy Excess Coverage | 3,000 | 3,000 | 1,000 |  | $ 3,000
Contract with Customer, Liability, Revenue Recognized |  | 700 | 1,100 | $ 1,400 |
Accounts Receivable, after Allowance for Credit Loss | 141,600 | 141,600 | 142,500 | 119,800 |
Cash, Uninsured Amount | $ 36,400 | 36,400 |  |  |
Depreciation, Increase Decrease |  | 6,400 |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  | $ (1,630) | $ 12,585 | 40,322 |
Finite-Lived Intangible Asset, Useful Life (Year) | 142 months | 142 months | 151 months |  |
Accrued Liabilities | $ 51,300 | $ 51,300 | $ 59,100 |  |
Employee-related Liabilities | 26,900 | 26,900 | 25,900 |  |
Accrued Purchased Transportation | 4,700 | 4,700 | $ 8,400 |  |
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% | 100.00% |  |
Drivers Advances and Other Receivables Net Of Allowance | 3,999 | $ 3,999 | $ 4,367 |  |
Interest Costs Capitalized |  | $ 100 | $ 300 | $ 300 |
Restricted Stock [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  |  | 0 |  |
Employee Stock Options [Member] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares |  | 0 | 0 | 208 |
Receivables from Insurers [Member] |  |  |  |  |
Drivers Advances and Other Receivables Net Of Allowance | 1,100 | $ 1,100 | $ 800 |  |
Insurance Settlements Receivable, Noncurrent | $ 600 | $ 600 | 1,300 |  |
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 | 20.00% | 20.00% |  |  |
Terminal Property [Member] | CALIFORNIA |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  | $ 7,600 |  |
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 |  | 45.00% | 44.00% | 43.00% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |  |  |
Number of Major Customers |  |  | 1 | 0 |
Transport Enterprise Leasing LLC [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 49.00% | 49.00% | 49.00% |  |

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