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Discontinued operations - Mexico project development (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total assets of discontinued operations | $ 22,319,927 | $ 22,677,588
Discontinued Operations | Mexico Project Development |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash | 750,048 | 154,130
Prepaid expenses and other current assets | 82,783 | 88,978
Value added taxes receivable (net of allowance of $967,115 and $316,217, respectively) | 340,910 | 1,267,991
Property, plant and equipment, net |  | 5,682
Land | 21,126,898 | 21,126,898
Other assets | 19,288 | 33,909
Total assets of discontinued operations | 22,319,927 | 22,677,588
Total liabilities of discontinued operations | 190,141 | 190,933
Value added tax, net of allowance | $ 1,279,757 | $ 316,217

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