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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Cash and cash equivalents (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash and Cash Equivalents [Line Items]
Bank accounts	$ 27,871,149	$ 22,760,231
Short term deposits	16,921,585	12,953,458
Total cash and cash equivalents	44,792,734	35,713,689	$ 33,626,516	$ 33,892,655
United States dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	10,961,159	7,809,107
Short term deposits	1,307,337	474,728
Cayman Islands dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	10,590,207	4,274,025
Bahamian dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	1,983,236	6,822,761
Short term deposits	15,614,248	12,478,730
Belize dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	4,213,923	3,658,705
Bermudian dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	4,571	5,507
Mexican Peso [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	27,872	53,203
Euro [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	23,819	30,291
Singapore dollar [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	25,879	27,641
Indonesian Rupiah [Member]
Cash and Cash Equivalents [Line Items]
Bank accounts	$ 40,483	$ 78,991