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Cost of revenues and general and administrative expenses (Details 1) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | $ 19,072,979 | $ 18,677,584 | $ 14,840,156
Employee costs [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 8,118,231 | 7,598,829 | 6,841,274
Insurance [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 761,115 | 782,013 | 802,386
Professional fees [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 1,362,332 | 1,101,938 | 941,193
Directors' fees and expenses [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 814,208 | 774,769 | 754,145
Depreciation [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 167,135 | 384,045 | 218,032
NSC project expenses [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 3,011,710 | 3,011,989 | 1,976,408
Amortization of intangibles [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | 1,363,849 | 1,410,143 | 89,896
Other [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
General and Administrative Expense | $ 3,474,399 | $ 3,613,858 | $ 3,216,822

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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