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Long term bank debt, current and non-current (Tables)
 6 Months Ended
Jun. 30, 2015
Debt Instruments [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
  June 30, 2015 Current Non-current December 31, 2014 Current Non-current
Royal Bank of Scotland - Credit facility$ 98,700$ 6,000$ 92,700$ 98,700$ 6,000$ 92,700
less unamortized deferred financing costs  (305)  (196)  (109)  (402)  (196)  (206)
Total bank debt, net of unamortized deferred financing costs$ 98,395$ 5,804$ 92,591$ 98,298$ 5,804$ 92,494