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Accrued liabilities
12 Months Ended
Dec. 31, 2018
Accrued Liabilities [Abstract]  
Accrued Liabilities

14.       Accrued liabilities:

The amounts shown in the consolidated balance sheets are analyzed as follows:

     2017   2018
Audit fees $ 243 $ 295
Legal fees                             59                             34
Other professional fees   86   1,502
Vessel Operating and voyage expenses   5,608   6,514
Loan interest and financing fees   4,287   8,277
Income tax   238   232
Total Accrued Liabilities $ 10,521 $ 16,854