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Cost of revenues and general and administrative expenses (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue $ 34,189,644 $ 42,443,580 $ 40,316,252
Electricity [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue 10,675,287 14,631,638 13,634,617
Depreciation [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue 5,270,454 5,077,293 4,822,967
Fuel oil [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue 4,974,421 8,726,195 10,106,409
Employee costs [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue 4,669,445 4,630,609 4,422,093
Cost of plant sales [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue 878,396 1,470,045 0
Maintenance [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue 3,429,736 3,131,947 2,332,893
Retail license royalties [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue 1,427,073 1,405,067 1,357,988
Insurance [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue 1,187,097 1,397,799 1,499,201
Other [Member]      
Cost of revenues and general and administrative expenses [Line Items]      
Cost of Revenue $ 1,677,735 $ 1,972,987 $ 2,140,084