Annual report [Section 13 and 15(d), not S-K Item 405]

Income taxes - Narrative (Details)

v3.25.1
Income taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]      
Expired net operating losses $ 324,799 $ 0  
NOLs which expire 19,240,000    
NOLs with indefinite carryforward 21,907,000    
Change in valuation allowance 921,000    
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 41,147,000    
Operating loss carryforwards, expired 623,000    
State Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 32,285,000    
Income Tax Provision      
Operating Loss Carryforwards [Line Items]      
Change in valuation allowance 920,794 $ (63,440)  
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