Quarterly report pursuant to Section 13 or 15(d)

Description of business and summary of significant accounting policies - Revenue by Product Line and Services (Details)

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Description of business and summary of significant accounting policies - Revenue by Product Line and Services (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenue by Producks and Services [Line Items]    
Products $ 2,807,347 $ 2,266,148
Services 4,039,420 2,809,367
Total revenues 6,846,767 5,075,515
Cogeneration    
Revenue by Producks and Services [Line Items]    
Products 2,296,637 1,417,972
Chiller & Heat Pump    
Revenue by Producks and Services [Line Items]    
Products 510,710 848,176
Service Contracts    
Revenue by Producks and Services [Line Items]    
Services 2,361,582 2,188,322
Installations    
Revenue by Producks and Services [Line Items]    
Services $ 1,677,838 $ 621,045