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Discontinued operations - Financial Information (Details) - Discontinued Operations - Mexico Project Development - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from operations	$ (312,794)	$ (316,365)
Gain on sale of discontinued operations	$ 1,136	$ 1,136

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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