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Accrued liabilities (Tables)
 12 Months Ended
Dec. 31, 2019
Accrued Liabilities [Abstract]  
Schedule of accrued liabilities
    December 31, 2018     December 31, 2019
Audit fees   $ 295   $ 232
Legal fees                              34     40
Other professional fees     1,502     1,540
Vessel Operating and voyage expenses     6,514     37,555
Loan interest and financing fees     8,277     7,394
Income tax     232                               -   
Total Accrued Liabilities   $ 16,854   $ 46,761