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Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Significant Accounting Policies [Abstract] |  |
Maximum original maturity of highly liquid investments, in order to be classified as cash and cash equivalents | 3 |
Write off of doubtful accounts | $ 0 | $ 0
Scrap value per light weight ton (LWT) | $0.2 |
Vessels useful life | 25 years |
Number of Reportable Segments | 1 |
Unearned revenue related to undelivered performance obligations | $ 371 | $ 0
Minimum |  |
Interval between vessel drydocking | 30 |
Maximum |  |
Interval between vessel drydocking | 60 |

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