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Cost of revenues and general and administrative expenses (Details 1) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense $ 15,844,303 $ 14,542,817 $ 13,651,650
Directors’ fees and expenses [Member]
      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 853,478 608,429 551,132
Insurance [Member]
      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 969,370 968,662 965,003
Depreciation [Member]
      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 290,622 421,851 252,303
Other Credit Device [Member]
      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 5,712,946 4,695,439 3,505,174
Employee costs [Member]
      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense 6,218,948 5,751,142 5,265,360
ProfessionalsFee [Member]
      
Cost of revenues and general and administrative expenses [Line Items]      
General and Administrative Expense $ 1,798,939 $ 2,097,294 $ 3,112,678