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Cost of revenues and general and administrative expenses (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | $ 36,872,165 | $ 33,624,821 | $ 33,807,982
Electricity [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | 9,832,128 | 9,037,347 | 10,675,287
Depreciation [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | 5,666,394 | 5,355,529 | 5,270,454
Fuel oil [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | 5,183,186 | 4,210,542 | 4,974,421
Employee costs [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | 5,666,972 | 5,541,983 | 4,287,783
Cost of plant sales [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | 0 | 142,151 | 878,396
Maintenance [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | 2,613,573 | 3,545,265 | 3,436,736
Retail license royalties [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | 1,537,879 | 1,528,914 | 1,427,073
Insurance [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | 944,975 | 992,374 | 1,187,097
Materials [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | 2,910,514 | 1,280,794 | 0
Other [Member] |  |  |
Cost of revenues and general and administrative expenses [Line Items] |  |  |
Cost of Revenue | $ 2,516,544 | $ 1,989,922 | $ 1,670,735

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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=63488584&loc=d3e20235-122688 + Details
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