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Discontinued operations - Mexico project development (Details) - USD ($) | Jun. 30, 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 | $ 22,610,408 | $ 22,677,588
Discontinued Operations | Mexico Project Development |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Cash | 69,158 | 154,130
Prepaid expenses and other current assets | 96,086 | 88,978
Value added taxes receivable | 1,314,857 | 1,267,991
Property, plant and equipment, net | 3,409 | 5,682
Land | 21,126,898 | 21,126,898
Other assets |  | 33,909
Total assets of discontinued operations | 22,610,408 | 22,677,588
Total liabilities of discontinued operations | $ 69,602 | $ 190,933

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