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Note 6 - Related-party Transactions (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Payments to Acquire Property, Plant, and Equipment, Total   $ 125,556 $ 234,372  
Limited Liability Company [Member]        
Notes Payable, Related Parties       $ 25,500
Repayments of Related Party Debt   26,600    
Paid-in-Kind Interest   8,600    
NMLH [Member] | Terminal Facility [Member]        
Payments to Acquire Property, Plant, and Equipment, Total $ 7,500      
NMLH [Member] | Rent Expense [Member]        
Related Party Transaction, Amounts of Transaction   $ 500 $ 800