Annual report pursuant to Section 13 and 15(d)

Acquisition of American DG Energy Inc. - Additional Information (Details)

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Acquisition of American DG Energy Inc. - Additional Information (Details) - USD ($)
May 18, 2017
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill   $ 2,406,156 $ 2,406,156 $ 5,281,867
Goodwill expected to be tax deductible $ 0      
American DG Energy        
Business Acquisition [Line Items]        
Ownership interest (percent) 100.00%      
Goodwill $ 13,300,000