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Deferred Revenue, current, detail (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Deferred Revenue Arrangement [Line Items]      
Amortization of deferred revenue $ 50 $ 50  
Deferred revenue, current 675   $ 491
Hires Collected In Advance [Member]      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue 675   441
Deferred Revenue From Lubricants [Member]      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue $ 0   $ 50