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Discontinued operations - Mexico project development - Financial Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Provision for uncollected value added taxes |  |  | $ 377,326 |
Loss from discontinued operations |  |  | $ 1,027,147 | $ 464,173
Depreciation expense |  |  |  | $ 2,273
Discontinued Operations. | Mexico Project Development |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Loss from discontinued operations | $ 419,833 | $ 151,379 |  |
Depreciation expense |  | $ 1,137 |  |

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