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v3.24.0.1

Note 2 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended | 48 Months Ended
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 | Dec. 31, 2023 USD ($)
Accounts Receivable, Allowance for Credit Loss, Recovery | $ 9,000,000 | $ 9,000,000 |  |
Accounts Receivable, Allowance for Credit Loss, Writeoff | 6,700,000 | 3,500,000 |  |
Equity Securities, FV-NI, Current | $ 0 | 0 |  | $ 0
Number of Operating Segments | 5 |  |  |
Self Insurance, Per Claim Amount, Personal Injury and Property Damage Claims |  |  |  | 500,000
Self Insurance Reserve | $ 523,000,000 | 427,000,000 |  | 523,000,000
Prepaid Insurance, Current and Noncurrent | 493,000,000 | 374,000,000 |  | 493,000,000
Assets, Current | 2,084,912,000 | 2,211,778,000 |  | 2,084,912,000
Accounts and Other Receivables, Net, Current [Member] |  |  |  |
Assets, Current | $ 276,000,000 | $ 198,000,000 |  | $ 276,000,000
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top 10 Customers [Member] |  |  |  |
Concentration Risk, Percentage | 36.00% | 38.00% | 39.00% |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |
Number of Major Customers | 1 | 1 | 1 |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Top 10 Customers [Member] |  |  |  |
Concentration Risk, Percentage | 34.00% | 36.00% |  |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member] |  |  |  |
Concentration Risk, Percentage | 13.00% | 14.00% | 12.00% |
Minimum [Member] |  |  |  |
Property, Plant and Equipment, Salvage Value, Percentage | 10.00% |  |  | 10.00%
Finite-Lived Intangible Asset, Useful Life | 2 years |  |  | 2 years
Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  | 10 years
Property, Plant and Equipment, Salvage Value, Percentage | 30.00% |  |  | 30.00%
Finite-Lived Intangible Asset, Useful Life | 15 years |  |  | 15 years
Tractors [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 4 years |  |  | 4 years
Tractors [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  | 10 years
Trailing Equipment [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |  | 7 years
Trailing Equipment [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 20 years |  |  | 20 years
Land, Buildings and Improvements [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  | 10 years
Land, Buildings and Improvements [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |  | 40 years
Computer Hardware and Software [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  | 3 years
Furniture and Fixtures [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  | 3 years
Furniture and Fixtures [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  | 10 years
Trade Accounts Receivable [Member] |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 24,600,000 | $ 22,300,000 |  | $ 24,600,000

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