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Discontinued operations - Mexico project development (Details) - USD ($) | Sep. 30, 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 | $ 21,427,879 | $ 21,660,768
Discontinued Operations. | Mexico Project Development |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash | 189,613 | 442,252
Accounts receivable | 12,675 | 12,675
Prepaid expenses and other current assets | 96,303 | 76,553
Value added taxes receivable (net of allowance of $1,940,725 and $1,711,234, respectively) | 21,126,898 | 21,126,898
Land | 2,390 | 2,390
Other assets | $ 21,427,879 | $ 21,660,768

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