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Financial risk management objectives and policies - Capital management 1 (Table) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Financial risk management objectives and policies [abstract] |  |  |  |
Interest bearing loans | $ 38,487 | $ 37,163 |  |
Cash (including restricted cash) | (4,801) | (1,396) |  |
Net debt | 33,686 | 35,767 |  |
Equity | 9,879 | 41,050 | $ 43,968 | $ 20,760
Adjustment for the market value of vessels (charter-free) | (2,902) | (27,500) |  |
Adjusted book capitalization | 6,977 | 13,550 |  |
Adjusted book capitalization plus net debt | $ 40,663 | $ 49,317 |  |
Ratio | 83.00% | 73.00% |  |

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