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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

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