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Discontinued operations - Mexico project development (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total assets of discontinued operations | $ 21,764,544 | $ 22,319,927
Discontinued Operations. | Mexico Project Development |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash | 536,249 | 750,048
Prepaid expenses and other current assets | 82,062 | 82,783
Value added taxes receivable (net of allowance of $1,657,083 and $1,279,757, respectively) | 2,224 | 340,910
Land | 21,126,898 | 21,126,898
Other assets | 17,111 | 19,288
Total assets of discontinued operations | 21,764,544 | 22,319,927
Total liabilities of discontinued operations | 201,107 | 190,141
Value added tax, net of allowance | $ 1,657,083 | $ 1,279,757

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