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Segment information (Details 2) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, plant and equipment, net $ 58,993,406 $ 64,185,110 $ 55,923,731
Cayman Island Operations [Member]
     
Property, plant and equipment, net 24,004,499 26,189,796  
Bahamas Operations [Member]
     
Property, plant and equipment, net 33,710,233 36,437,351  
Belize Operations [Member]
     
Property, plant and equipment, net 1,134,721 1,202,017  
All Other Countries [Member]
     
Property, plant and equipment, net $ 143,953 $ 355,946