Discontinued operations - Mexico project development (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets of discontinued operations	$ 314,847	$ 21,340,805
Discontinued Operations. | Mexico Project Development
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	169,848	91,283
Prepaid expenses and other current assets	144,999	120,234
Land		21,126,898
Other assets		2,390
Total assets of discontinued operations	314,847	21,340,805
Total liabilities of discontinued operations	$ 451,839	$ 364,665