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v3.19.1

Retirement benefits (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Pension Expense | $ 408,128 | $ 384,624
CAYMAN ISLANDS |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 5.00% |
BAHAMAS |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 5.00% |
FLORIDA |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 6.00% |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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