General form of registration statement for all companies including face-amount certificate companies

Summary of significant accounting policies - Revenue by Product Line and Services (Details)

v2.4.0.8
Summary of significant accounting policies - Revenue by Product Line and Services (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenue by Producks and Services [Line Items]              
Products $ 807,854 $ 1,347,719 $ 2,860,519 $ 2,837,426 $ 7,453,222 $ 4,569,113 $ 5,543,605
Services 1,995,606 2,037,181 3,989,259 3,800,002 7,800,750 6,496,097 5,767,624
Total revenues 2,803,460 3,384,900 6,849,778 6,637,428 15,253,972 11,065,210 11,311,229
Cogeneration
              
Revenue by Producks and Services [Line Items]              
Products 457,486 637,420 1,735,642 1,219,670 5,791,412 2,737,161 4,977,595
Chiller
              
Revenue by Producks and Services [Line Items]              
Products $ 350,368 $ 710,299 $ 1,124,877 $ 1,617,756 $ 1,661,810 $ 1,831,952 $ 566,010