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Cost of revenues and general and administrative expenses (Details 1) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | $ 18,709,419 | $ 18,682,399
Employee costs [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 8,400,729 | 8,061,686
Insurance [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 751,541 | 734,003
Professional fees [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 1,250,634 | 1,375,965
Directors' fees and expenses [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 845,891 | 804,110
Depreciation [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 158,404 | 164,025
NSC project expenses [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 2,884,213 | 3,011,710
Amortization of intangibles [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | 1,340,000 | 1,363,849
Other [Member] |  |
Cost of revenues and general and administrative expenses [Line Items] |  |
General and Administrative Expense | $ 3,078,007 | $ 3,167,051

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