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Summary of significant accounting policies - Revenue by Product Line and Services (Details) (USD $)
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12 Months Ended | |
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Dec. 31, 2013
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Dec. 31, 2012
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| Revenue by Producks and Services [Line Items] | ||
| Products | $ 6,346,050 | $ 7,453,222 |
| Services | 9,503,819 | 7,800,750 |
| Total revenues | 15,849,869 | 15,253,972 |
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Cogeneration
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| Revenue by Producks and Services [Line Items] | ||
| Products | 5,199,649 | 5,791,412 |
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Chiller
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| Revenue by Producks and Services [Line Items] | ||
| Products | 1,146,401 | 1,661,810 |
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Service contracts
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| Revenue by Producks and Services [Line Items] | ||
| Services | 7,071,388 | 7,089,491 |
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installations
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| Revenue by Producks and Services [Line Items] | ||
| Services | $ 2,432,431 | $ 711,259 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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