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Note 2 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended 36 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
Dec. 31, 2022
USD ($)
Accounts Receivable, Allowance for Credit Loss, Recovery $ 9,000,000.0 $ 2,600,000    
Accounts Receivable, Allowance for Credit Loss, Writeoff 3,500,000 4,200,000    
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 $ 427,000,000 287,000,000   427,000,000
Prepaid Insurance, Current and Noncurrent 374,000,000 311,000,000   374,000,000
Assets, Current, Total 2,211,778,000 2,313,369,000   2,211,778,000
Accounts and Other Receivables, Net, Current [Member]        
Assets, Current, Total $ 198,000,000 $ 171,000,000   $ 198,000,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Number of Major Customers 10 10 10  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Top 10 Customers [Member]        
Concentration Risk, Percentage 38.00% 39.00% 37.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Number of Major Customers 10      
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Top 10 Customers [Member]        
Number of Major Customers   10    
Concentration Risk, Percentage 36.00% 39.00%    
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]        
Number of Major Customers 1 1    
Concentration Risk, Percentage 14.00% 12.00% 10.00%  
Minimum [Member]        
Property, Plant and Equipment, Salvage Value, Percentage 10.00%     10.00%
Finite-Lived Intangible Asset, Useful Life 2 years      
Maximum [Member]        
Property, Plant and Equipment, Useful Life 10 years      
Property, Plant and Equipment, Salvage Value, Percentage 30.00%     30.00%
Finite-Lived Intangible Asset, Useful Life 15 years      
Tractors [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life 4 years      
Tractors [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life 10 years      
Trailing Equipment [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life 7 years      
Trailing Equipment [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life 20 years      
Land, Buildings and Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life 10 years      
Land, Buildings and Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life 40 years      
Computer Hardware and Software [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life 3 years      
Furniture and Fixtures [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life 3 years      
Furniture and Fixtures [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life 10 years      
Trade Accounts Receivable [Member]        
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 22,300,000 $ 16,800,000   $ 22,300,000