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Capital leases (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Subsidiary
Dec. 31, 2012
Capital leases [Abstract]    
Number of subsidiaries under capital lease arrangement 2  
Rapid amount under capital lease $ 17,900,000  
Capital Lease Obligations [Abstract]    
Current portion of capital lease obligations 1,578,686 0
Non-current portion of capital lease obligations 28,800,329 0
Total capital lease obligations 30,379,015  
Future Minimum Payments [Abstract]    
2014 3,834,690  
2015 3,834,690  
2016 3,845,196  
2017 3,834,690  
2018 23,705,540  
Total minimum lease payments 39,054,806  
Less amount representing interest (8,675,791)  
Net minimum lease payments 30,379,015  
Vessel and Equipment [Member]
    
Capital Leased Assets [Line Items]    
Vessels and equipment 41,326,198  
Accumulated depreciation (4,009,872)  
Total $ 37,316,326