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Supplemental disclosure of cash flow information (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Interest Costs Capitalized |  | 246,851 |
Common Stock [Member] |  |  |
Stock Issued During Period, Shares, Issued for Services | 21,686 | 11,158 | 8,565
Redeemable Preferred Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 10,033 | 7,455 | 5,379
Conversion of preferred stock (in shares) | 2,629 | 2,145 | 4,950

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