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Discontinued operations - Mexico project development (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total assets of discontinued operations | $ 21,340,805 | $ 21,660,768
Discontinued Operations. | Mexico Project Development |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash | 91,283 | 442,252
Accounts receivable |  | 12,675
Prepaid expenses and other current assets | 120,234 | 76,553
Land | 21,126,898 | 21,126,898
Other assets | 2,390 | 2,390
Total assets of discontinued operations | 21,340,805 | 21,660,768
Total liabilities of discontinued operations | $ 364,665 | $ 389,884

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