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Note 11 - Equity Method Investment (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Proceeds from Sale of Property, Plant, and Equipment, Total     $ 43,812 $ 86,555  
Payments to Acquire Property, Plant, and Equipment, Total     21,801 63,614  
Reversal of Deferred Gains of Sale of Property     53 (77)  
Income (Loss) from Equity Method Investments, Total $ 3,230 $ 1,176 $ 9,572 971  
Transport Enterprise Leasing LLC [Member]          
Equity Method Investment, Ownership Percentage 49.00%   49.00%    
Proceeds from Sale of Property, Plant, and Equipment, Total     $ 1,000 0  
Revenue from Related Parties     700 6,300  
Payments to Acquire Property, Plant, and Equipment, Total     0 0  
Payments for Rent     200 100  
Deferred Gain on Sale of Property $ 100 100 100 100  
Reversal of Deferred Gains of Sale of Property     100 100  
Due from Related Parties, Total 800   800   $ 700
Income (Loss) from Equity Method Investments, Total     9,600    
Proceeds from Equity Method Investment, Distribution     2,000    
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member]          
Deferred Gain on Sale of Property $ 300 $ 200 $ 300 $ 200