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Discontinued operations - Mexico project development (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total assets of discontinued operations $ 21,899,816 $ 22,677,588
Discontinued Operations | Mexico Project Development    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Cash 36,326 154,130
Prepaid expenses and other current assets 88,777 88,978
Value added taxes receivable (net of allowance of $967,115 and $316,217, respectively) 645,542 1,267,991
Property, plant and equipment, net 2,273 5,682
Land 21,126,898 21,126,898
Other assets   33,909
Total assets of discontinued operations 21,899,816 22,677,588
Total liabilities of discontinued operations 252,720 190,933
Value added tax, net of allowance $ 967,115 $ 316,217