Quarterly report pursuant to Section 13 or 15(d)

Acquisition of American DG Energy, Inc. - Pro Forma Information (Details)

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Acquisition of American DG Energy, Inc. - Pro Forma Information (Details) - American DG Energy, Inc. - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]    
Total revenues $ 25,030,586 $ 21,240,102
Net income (loss) $ (998,323) $ (2,236,396)
Basic earnings (loss) per share (in USD per share) $ (0.04) $ (0.09)
Diluted earnings (loss) per share (in USD per share) $ (0.04) $ (0.09)