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Income taxes - Narrative (Details) - USD ($) | 12 Months Ended
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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 |  |

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