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Note 11 - Equity Method Investment (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Proceeds from Sale of Property, Plant, and Equipment, Total $ 704 $ 13,871  
Payments to Acquire Property, Plant, and Equipment, Total 8,690 3,907  
Reversal of Deferred Gains of Sale of Property (30) 45  
Income (Loss) from Equity Method Investments $ 6,785 $ 2,960  
Transport Enterprise Leasing LLC [Member]      
Equity Method Investment, Ownership Percentage 49.00% 49.00%  
Proceeds from Sale of Property, Plant, and Equipment, Total $ 0 $ 800  
Revenue from Related Parties 200   $ 300
Payments to Acquire Property, Plant, and Equipment, Total 0 0  
Payments for Rent 200 100  
Reversal of Deferred Gains of Sale of Property 100 100  
Due from Related Parties, Total 0   $ 1,000
Income (Loss) from Equity Method Investments 6,800    
Proceeds from Equity Method Investment, Distribution 0    
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member]      
Deferred Gain on Sale of Property $ 200 $ 300