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Segment information (Details 2) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net $ 53,743,170 $ 56,396,988
Cayman Island operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net 22,518,524 23,681,420
Bahamas operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net 27,441,376 28,208,145
Belize operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net 920,149 1,025,970
Indonesia operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net 2,665,312 3,245,846
All other country operations [Member]    
Segment Reporting Information [Line Items]    
Property, Plant and Equipment, Net $ 197,809 $ 235,607