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Discontinued operations - Mexico project development - Financial Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Loss from discontinued operations | $ 2,371,049 | $ 2,574,079
Discontinued Operations. | Mexico Project Development |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Provision for uncollected value added taxes | 377,326 | 963,540
Loss from operations | $ (2,371,049) | (2,574,079)
Depreciation expense |  | $ 4,545

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