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Note 2 - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Equity Securities, FV-NI $ 0 $ 0    
Number of Operating Segments 4      
Self Insurance, Per Claim Amount, Personal Injury and Property Damage Claims $ 500,000 500,000 $ 500,000  
Self Insurance, Per Claim Deductible, Workers' Compensation Claims   100,000 $ 100,000  
Self Insurance Reserve 263,000,000 260,000,000    
Prepaid Insurance, Current and Noncurrent 281,000,000 261,000,000    
Assets, Current, Total 1,481,299,000 1,502,981,000    
Other Assets, Noncurrent, Total 165,857,000 38,398,000    
Other Accrued Liabilities, Current 85,355,000 35,845,000    
Other Liabilities, Noncurrent, Total 173,241,000 96,056,000    
Accounting Standards Update 2016-02 [Member]        
Other Assets, Noncurrent, Total       $ 102,400,000
Other Accrued Liabilities, Current       32,300,000
Other Liabilities, Noncurrent, Total       $ 70,100,000
Accounts and Other Receivables, Net, Current [Member]        
Assets, Current, Total $ 157,000,000 $ 158,000,000    
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 32.00% 30.00% 29.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Top 10 Customers [Member]        
Number of Major Customers 10 10    
Concentration Risk, Percentage 34.00% 32.00%    
Minimum [Member]        
Property, Plant and Equipment, Salvage Value, Percentage 10.00%      
Finite-Lived Intangible Asset, Useful Life 2 years      
Maximum [Member]        
Property, Plant and Equipment, Salvage Value, Percentage 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      
Computer Hardware and Software [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life 7 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 $ 22,500,000 $ 23,600,000    
Other Receivables [Member]        
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 0 $ 12,200,000