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