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Unearned Revenue/ Accrued revenue (Tables)
12 Months Ended
Dec. 31, 2016
Deferred Received In Advance And Unearned Revenue  
Unearned Revenue And Cash Received In Advance
   December 31,
   2015 2016
 Unearned Revenue       
  Cash received in advance of service provided – Current liability  $1,956 $2,029
  Deferred revenue resulting from varying charter rates      
  Current liability    -  11
 Total Unearned Revenue  $1,956 $2,040
        
 Accrued Revenue      
  Resulting from revenue earned prior to cash being received – Current asset $ 87 $ 166
  Resulting from varying charter rates –Non Current asset    918   929
 Total Accrued Revenue  $ 1,005 $ 1,095