Discontinued operations - Mexico project development (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total assets of discontinued operations	$ 22,543,823	$ 22,677,588
Discontinued Operations | Mexico Project Development
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	41,198	154,130
Prepaid expenses and other current assets	115,174	88,978
Value added taxes receivable	1,256,007	1,267,991
Property, plant and equipment, net	4,546	5,682
Land and rights of way	21,126,898	21,126,898
Other assets		33,909
Total assets of discontinued operations	22,543,823	22,677,588
Total liabilities of discontinued operations	$ 102,892	$ 190,933