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Discontinued operations - Mexico project development - Financial Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Discontinued Operations. | Mexico Project Development |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss from discontinued operations | $ 232,994 | $ 505,917 | $ 699,858 | $ 1,533,064

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