Discontinued operations - Mexico project development - Financial Information (Details) - Discontinued Operations. - Mexico Project Development - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Provision for uncollected value added taxes		$ 641,810	$ 377,326	$ 650,897
Loss from discontinued operations	$ 505,917	1,078,367	$ 1,533,064	1,542,540
Depreciation expense		$ 1,136		$ 3,409

Amount of depreciation and amortization expense attributable to disposal group, including, but not limited to, discontinued operation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration