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Income taxes (Details 3) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Operating loss carryforwards - Mexico | $ 3,020,049 | $ 4,923,026
Land basis difference - Mexico | 999,719 | 702,547
Start-up costs - Mexico | 3,856,942 | 747,215
Valuation allowances | (7,876,710) | (6,372,788)
Deferred Tax Assets, Net of Valuation Allowance | 0 | 0
Deferred tax liabilities: |  |
Property and equipment - U.S. | 180,431 | 205,827
Intangible assets - U.S. | 479,443 | 819,066
Deferred Tax Liabilities, Gross | 659,874 | 1,024,893
Net deferred tax liability | $ 659,874 | $ 1,024,893

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