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Note 1 - Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Jul. 08, 2020
Oct. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Sep. 23, 2020
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax, Total     $ 3,412   $ (0)  
Tractors [Member]            
Property, Plant and Equipment, Useful Life (Year)     5 years      
Tractors [Member] | Minimum [Member]            
Property, Plant and Equipment, Salvage Value, Percentage     10.00%      
Tractors [Member] | Maximum [Member]            
Property, Plant and Equipment, Salvage Value, Percentage     35.00%      
Refrigerated Trailers [Member]            
Property, Plant and Equipment, Useful Life (Year)     7 years      
Dry Van Trailers [Member]            
Property, Plant and Equipment, Useful Life (Year)     10 years      
Dry Van Trailers [Member] | Minimum [Member]            
Property, Plant and Equipment, Salvage Value, Percentage     28.00%      
Dry Van Trailers [Member] | Maximum [Member]            
Property, Plant and Equipment, Salvage Value, Percentage     21.00%      
Transport Financial Services [Member] | Discontinued Operations, Disposed of by Sale [Member]            
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net $ 103,300          
Disposal Group, Including Discontinued Operation, Consideration 122,300         $ 108,400
Proceeds from Divestiture of Businesses 108,400          
Disposal Group, Including Discontinued Operation, Consideration, Equity Interest Acquired 13,900          
Disposal Group, Including Discontinued Operation, Earnout Opportuntiy, Maximum 9,900          
Disposal Group Including Discontinued Operation, Dispute over Nature of Assets 66,000          
Disposal Group, Including Discontinued Operation, Consideration Returned upon Settlement   $ 28,100        
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total   $ 3,700        
Disposal Group Including Discontinued Operation, Assets Advances Against Future Payments For Services Not Yet Performed 62,000          
Disposal Group Including Discontinued Operation, Indemnity, Loss Amount $ 30,000          
Disposal Group Including Discontinued Operation, Indemnity, Percentage of Next 30 Million Loss 50.00%          
Disposal Group Including Discontinued Operation, Total Indemnification $ 45,000     $ 44,200    
Discontinued Operation, Amount of Continuing Cash Flows after Disposal     $ 35,600 $ (35,600)    
Discontinued Operation, Amount of Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax, Total     $ 3,412   $ (0)