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Cost of revenues and general and administrative expenses (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cost of revenues | $ 43,458,260 | $ 36,132,425 | $ 34,098,059
Electricity [Member] |  |  |
Cost of revenues | 14,473,583 | 12,622,788 | 10,132,956
Depreciation [Member] |  |  |
Cost of revenues | 6,959,912 | 5,537,098 | 5,854,297
Fuel Oil [Member] |  |  |
Cost of revenues | 10,078,724 | 7,195,692 | 4,928,409
Employee Costs [Member] |  |  |
Cost of revenues | 4,423,899 | 4,276,682 | 4,444,814
Cost Of Plant Sales [Member] |  |  |
Cost of revenues | 0 | 61,843 | 1,833,835
Maintenance [Member] |  |  |
Cost of revenues | 2,849,453 | 2,140,776 | 2,541,927
Royalties [Member] |  |  |
Cost of revenues | 1,451,672 | 1,406,160 | 1,368,181
Insurance [Member] |  |  |
Cost of revenues | 1,625,733 | 1,545,771 | 1,490,121
Other Credit Derivatives [Member] |  |  |
Cost of revenues | $ 1,595,284 | $ 1,345,615 | $ 1,503,519

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration