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Unearned Revenue/Accrued Revenue, detail (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred Revenue Arrangement [Line Items]    
Current liability $ 2,040 $ 1,956
Total Unearned Revenue 2,040 1,956
Accrued Revenue [Abstract]    
Resulting from revenue earned prior to cash being received - Current asset 166 87
Resulting from varying charter rates - Non Current asset 929 918
Total Accrued Revenue 1,095 1,005
Cash received in advance of service provided    
Deferred Revenue Arrangement [Line Items]    
Current liability 2,029 1,956
Deferred revenue resulting from varying charter rates    
Deferred Revenue Arrangement [Line Items]    
Current liability $ 11 $ 0