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Cost of revenues and general and administrative expenses (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost Of Revenue | $ 40,316,252 | $ 43,458,260 | $ 36,132,425
Electricity [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost Of Revenue | 13,634,617 | 14,473,583 | 12,622,788
Depreciation [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost Of Revenue | 4,822,967 | 6,959,912 | 5,537,098
Fuel oil [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost Of Revenue | 10,106,409 | 10,078,724 | 7,195,692
Employee costs [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost Of Revenue | 4,422,093 | 4,423,899 | 4,276,682
Maintenance [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost Of Revenue | 2,332,893 | 2,849,453 | 2,140,776
Royalties [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost Of Revenue | 1,357,988 | 1,451,672 | 1,406,160
Insurance [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost Of Revenue | 1,499,201 | 1,625,733 | 1,545,771
Other [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost Of Revenue | $ 2,140,084 | $ 1,595,284 | $ 1,407,458

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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=26872669&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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