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Deferred revenue, current and non-current (Tables)
 12 Months Ended
Dec. 31, 2012
Deferred Revenue Disclosure [Abstract]  
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
   2012 2011
Hires collected in advance $ 1,157$ -
Deferred revenue from lubricants  378  467
 Total $ 1,535$ 467
Less current portion $ (1,264)$ (103)
 Non-current portion $ 271$ 364