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Note 10 - Equity Method Investment (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May 31, 2011
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (Loss) from Equity Method Investments   $ 3,400 $ 3,000 $ 4,570
Proceeds from Sale of Property, Plant, and Equipment   48,749 65,507 34,287
Equity Method Investments   $ 20,145 $ 18,526  
Transport Enterprise Leasing LLC [Member]        
Equity Method Investment, Ownership Percentage 49.00% 49.00% 49.00%  
Payments to Acquire Equity Method Investments $ 1,500      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 4,500      
Income (Loss) from Equity Method Investments   $ 3,400 $ 3,000 4,600
Option to Acquire Interest in Equity Method Investment, Percentage of Ownership   51.00%    
Proceeds from Sale of Property, Plant, and Equipment   $ 200 400  
Revenue from Related Parties   5,900 5,000  
Payments for Rent   500 0  
Deferred Gain on Sale of Property   200 200  
Due from Related Parties   8,600 3,700  
Proceeds from Equity Method Investment, Distribution   2,000 1,500 $ 0
Equity Method Investments   20,100 18,500  
Equity Method Investment, Aggregate Cost   4,900    
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member]        
Deferred Gain on Sale of Property   $ 400 $ 600  
Transport Enterprise Leasing LLC [Member] | Based on 2011 Results [Member]        
Business Combination, Contingent Consideration, Liability 1,000      
Transport Enterprise Leasing LLC [Member] | Based on 2012 Results [Member]        
Income (Loss) from Equity Method Investments $ 2,400