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Income taxes - Net long-term deferred tax liability (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Research & development tax credits $ 613,003 $ 166,653
Accrued compensation 110,092 0
Valuation allowances (496,343) (43,900)
Deferred Tax Assets, Net of Valuation Allowance 226,752 122,753
Deferred tax liabilities:    
Property and equipment 252,800 148,707
Intangible assets 1,188,009 1,380,328
Deferred Tax Liabilities, Gross 1,440,809 1,529,035
Net deferred tax liability 1,214,057 1,406,282
Discontinued Operations    
Deferred tax assets:    
Operating loss carryforwards - Mexico 4,296,453 3,427,295
Land basis difference - Mexico 1,262,159 1,164,365
Start-up costs - Mexico 4,904,337 4,608,990
Valuation allowances (10,462,949) (9,200,650)
Deferred Tax Assets, Net of Valuation Allowance $ 0 $ 0