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Financial risk management objectives and policies - Capital management 1 (Table) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Financial risk management objectives and policies [abstract] |  |  |  |
Interest bearing loans | $ 37,863 | $ 41,660 |  |
Cash (including restricted cash) | (1,396) | (2,966) |  |
Net debt | 36,467 | 38,694 |  |
Equity | 41,050 | 43,968 | $ 20,760 | $ 30,535
Adjustment for the market value of vessels (charter-free) | (27,500) | (31,970) |  |
Adjusted book capitalization | 13,550 | 11,998 |  |
Adjusted book capitalization plus net debt | $ 50,017 | $ 50,692 |  |
Ratio | 73.00% | 76.00% |  |

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