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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Income (Loss) from Equity Method Investments   $ 3,000 $ 4,570 $ 3,730
Proceeds from Sale of Property, Plant, and Equipment   65,507 34,287 78,776
Proceeds from Equity Method Investment, Dividends or Distributions   307
Equity Method Investments   $ 18,526 16,788  
Transport Enterprise Leasing LLC [Member]        
Equity Method Investment, Ownership Percentage 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   $ 3,000 4,600 3,700
Option to Acquire Interest in Equity Method Investment, Percentage of Ownership   51.00%    
Proceeds from Sale of Property, Plant, and Equipment   $ 400 6,200  
Revenue from Related Parties   5,000 1,300  
Deferred Gain on Sale of Property   200 100  
Due from Related Parties   3,700 5,300  
Proceeds from Equity Method Investment, Dividends or Distributions   1,500 0 $ 300
Equity Method Investments   18,500 16,800  
Equity Method Investment, Aggregate Cost   4,900    
Transport Enterprise Leasing LLC [Member] | Reduction in TEL Investment [Member]        
Deferred Gain on Sale of Property   $ 600 $ 800  
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