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Note 9 - Equity Method Investment (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Proceeds from Sale of Property, Plant, and Equipment, Total $ 46,609 $ 61,687 $ 48,749
Payments to Acquire Property, Plant, and Equipment, Total 138,273 75,142 110,802
Reversal of Deferred Gains of Sale of Property (7) (189) (179)
Income (Loss) from Equity Method Investments, Total 7,017 7,732 3,400
Equity Method Investments $ 31,906 $ 26,106  
Transport Enterprise Leasing LLC [Member]      
Equity Method Investment, Ownership Percentage 49.00% 49.00%  
Option to Acquire Interest in Equity Method Investment, Percentage of Ownership 51.00%    
Proceeds from Sale of Property, Plant, and Equipment, Total $ 0 $ 100 100
Revenue from Related Parties 9,400 8,200 500
Payments to Acquire Property, Plant, and Equipment, Total 10,500 1,800 0
Payments for Rent 600 900 100
Reversal of Deferred Gains of Sale of Property 100 200  
Proceeds from Equity Method Investment, Distribution 1,200 2,000 200
Due from Related Parties, Total 1,300 7,200  
Income (Loss) from Equity Method Investments, Total 7,000 7,700 $ 3,400
Equity Method Investments 31,900 26,100  
Equity Method Investment, Aggregate Cost 4,900    
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member]      
Deferred Gain on Sale of Property $ 200 $ 200