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Cash and cash equivalents and restricted cash (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Bank accounts $ 33,523,679 $ 21,216,182    
Total cash and cash equivalents 33,892,655 37,624,179 46,130,237 44,429,190
United States Dollar [Member]
        
Bank accounts 7,139,591 4,719,808    
United States Dollar One [Member]
        
Short term deposits 368,976 7,809,598    
Cayman Islands Dollar [Member]
        
Bank accounts 10,907,483 12,360,952    
Bahamian Dollar [Member]
        
Bank accounts 13,308,338 2,250,883    
Short term deposits 0 8,598,399    
Belize Dollar [Member]
        
Bank accounts 2,007,243 1,723,264    
Bermudian Dollar [Member]
        
Bank accounts 11,930 142,363    
Mexican Peso Dollar [Member]
        
Bank accounts 14,198 10,459    
Euro Dollar [Member]
        
Bank accounts 14,264 8,453    
Singapore Dollar [Member]
        
Bank accounts 8,190 0    
Indonesian Rupiah [Member]
        
Bank accounts $ 112,442 $ 0