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Cost of revenues and general and administrative expenses (Details 1) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense $ 14,458,494 $ 16,654,439 $ 15,844,303
Employee costs [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 6,459,612 6,314,908 6,218,948
Insurance [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 802,386 923,089 969,370
Professional fees [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 941,193 1,424,927 1,005,495
Directors' fees and expenses [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 754,145 686,228 752,044
Depreciation [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 218,032 278,478 290,622
NSC project expenses [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 2,168,408 3,702,332 3,158,309
Other [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense $ 3,114,718 $ 3,324,477 $ 3,449,515