Annual report pursuant to Section 13 and 15(d)

Income taxes - Narrative (Details)

v3.22.0.1
Income taxes - Narrative (Details) - USD ($)
12 Months Ended
Sep. 08, 2021
Jan. 11, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2018
Feb. 05, 2021
Apr. 17, 2020
PPP Loan Program | Webster Business Credit Corporation              
Operating Loss Carryforwards [Line Items]              
Notes payable           $ 1,874,269 $ 1,874,200
Debt forgiveness, principal amount   $ 1,874,200          
Debt forgiveness, amount $ 1,874,269            
Debt forgiveness, accrued interest $ 11,386 $ 12,733          
Internal Revenue Service (IRS)              
Operating Loss Carryforwards [Line Items]              
Operating loss carryforwards     $ 37,515,000        
NOLs which expire     27,640,000        
NOLs with indefinite carryforward     9,875,000        
State Jurisdiction              
Operating Loss Carryforwards [Line Items]              
NOLs which expire     1,414,000        
Income Tax Provision              
Operating Loss Carryforwards [Line Items]              
Change in valuation allowance     84,000 $ 1,049,000      
American DG Energy              
Operating Loss Carryforwards [Line Items]              
Ownership interest (percent)         100.00%    
Annual limitation of acquired NOL     $ 391,940        
Period of limitation on acquired NOL     20 years