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Supplemental disclosure of cash flow information (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Supplemental Disclosure Of Cash Flow Information [Line Items]      
Interest Costs Capitalized     $ 246,851
Common Stock [Member]
      
Supplemental Disclosure Of Cash Flow Information [Line Items]      
Stock Issued During Period, Shares, New Issues 25,111 21,686 11,158
Redeemable Preferred Stock [Member]
      
Supplemental Disclosure Of Cash Flow Information [Line Items]      
Stock Issued During Period, Shares, New Issues 10,180 11,417 8,345
Stock Issued During Period, Shares, Conversion of Convertible Securities 4,720 2,629 2,145