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Note 1 - Significant Accounting Policies (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2021
Jul. 08, 2020
Dec. 31, 2019
Depreciation, Depletion and Amortization, Nonproduction, Total $ 19,663   $ 20,568   $ 37,846 $ 40,413      
Net Income (Loss) Attributable to Parent, Total (22,343) $ (2,213) $ 6,071 $ 4,433 (24,556) $ 10,504      
Insurance Policy Primary Occurence Limit 9,000 10,000     9,000   $ 9,000    
Insurance Policy Excess Coverage $ 1,000 $ 10,000     $ 1,000   $ 1,000    
Tractors [Member]                  
Property, Plant and Equipment, Useful Life (Year)         5 years        
Property, Plant and Equipment, Salvage Value, Percentage 15.00%       15.00%        
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        
Property, Plant and Equipment, Salvage Value, Percentage 25.00%       25.00%        
Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member]                  
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net $ 98,131       $ 98,131       $ 86,620
Disposal Group, Including Discontinued Operation, Allowance $ 600       600       $ 408
Subsequent Event [Member] | Transport Financial Services [Member] | Discontinued Operations, Held-for-sale [Member]                  
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net               $ 103,300  
Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Gross               108,700  
Disposal Group, Including Discontinued Operation, Allowance               $ 5,400  
Intangible Assets, Amortization Period [Member]                  
Depreciation, Depletion and Amortization, Nonproduction, Total         3,200        
Net Income (Loss) Attributable to Parent, Total         $ (2,200)        
Earnings Per Share, Diluted, Total (in dollars per share) $ (0.13)