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Cost of revenues and general and administrative expenses | 12 Months Ended
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Dec. 31, 2012
Cost Of Revenues and General and Administrative Expenses [Abstract] |
Disclosure Of Other Operating Cost and Expense [Text Block] | 14. Cost of revenues and general and administrative expenses
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Cost of revenues consist of: |  |  |  |  |  |  |  |  |  |  |  |
Electricity |  | $ | 14,473,583 |  |  | $ | 12,622,788 |  |  | $ | 10,132,956 |
Depreciation |  |  | 6,959,912 |  |  |  | 5,537,098 |  |  |  | 5,854,297 |
Fuel oil |  |  | 10,078,724 |  |  |  | 7,195,692 |  |  |  | 4,928,409 |
Employee costs |  |  | 4,423,899 |  |  |  | 4,276,682 |  |  |  | 4,444,814 |
Cost of plant sales |  |  | - |  |  |  | 61,843 |  |  |  | 1,833,835 |
Maintenance |  |  | 2,849,453 |  |  |  | 2,140,776 |  |  |  | 2,541,927 |
Royalties |  |  | 1,451,672 |  |  |  | 1,406,160 |  |  |  | 1,368,181 |
Insurance |  |  | 1,625,733 |  |  |  | 1,545,771 |  |  |  | 1,490,121 |
Other |  |  | 1,595,284 |  |  |  | 1,345,615 |  |  |  | 1,503,519 |
|  | $ | 43,458,260 |  |  | $ | 36,132,425 |  |  | $ | 34,098,059 |
General and administrative expenses consist of: |  |  |  |  |  |  |  |  |  |  |  |
Employee costs |  | $ | 5,751,142 |  |  | $ | 5,265,360 |  |  | $ | 4,219,915 |
Insurance |  |  | 968,662 |  |  |  | 965,003 |  |  |  | 951,715 |
Professional fees |  |  | 2,097,294 |  |  |  | 3,112,678 |  |  |  | 2,805,146 |
Directors’ fees and expenses |  |  | 608,429 |  |  |  | 551,132 |  |  |  | 519,786 |
Depreciation |  |  | 421,851 |  |  |  | 252,303 |  |  |  | 340,969 |
Other |  |  | 4,695,439 |  |  |  | 3,505,174 |  |  |  | 2,492,117 |
|  | $ | 14,542,817 |  |  | $ | 13,651,650 |  |  | $ | 11,329,648 |

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- Definition The entire disclosure for cost of revenues and general and administrative expenses. + References No definition available. + Details
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