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Income taxes - Net long-term deferred tax liability (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Operating loss carryforwards - Mexico $ 3,427,295 $ 3,020,049
Land basis difference - Mexico 1,164,365 999,719
Start-up costs - Mexico 4,608,990 3,856,942
Research & development tax credits - U.S. 166,653 0
Valuation allowances (9,244,550) (7,876,710)
Deferred Tax Assets, Net of Valuation Allowance 122,753 0
Deferred tax liabilities:    
Property and equipment - U.S. 148,707 180,431
Intangible assets - U.S. 1,380,328 479,443
Deferred Tax Liabilities, Gross 1,529,035 659,874
Net deferred tax liability $ 1,406,282 $ 659,874