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Cash and cash equivalents (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | $ 30,794,936 | $ 37,754,409 |  |
Short term deposits | 16,388,030 | 1,499,707 |  |
Total cash and cash equivalents | 47,182,966 | 39,254,116 | $ 44,792,734 | $ 35,713,689
United States dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 6,764,201 | 11,350,895 |  |
Short term deposits | 10,559,407 | 490,914 |  |
Cayman Islands dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 4,306,768 | 16,511,673 |  |
Short term deposits | 4,802,060 | 0 |  |
Bahamian dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 13,310,936 | 4,859,914 |  |
Short term deposits | 1,026,563 | 1,008,793 |  |
Belize dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 6,346,184 | 4,884,161 |  |
Bermudian dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 3,502 | 3,733 |  |
Mexican peso [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 17,014 | 83,752 |  |
Euro Member Countries, Euro |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 0 | 5,221 |  |
Singapore dollar [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | 0 | 25,840 |  |
Indonesian rupiah [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Bank accounts | $ 46,331 | $ 29,220 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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