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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
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%