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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