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Income taxes (Details 3) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Operating loss carryforwards - Mexico | $ 4,923,026 | $ 4,462,746
Land basis difference | 702,547 | 414,101
Start-up costs | 747,215 | 668,161
Operating loss carryforwards - United States | 0 | 150,758
Valuation allowances | (6,372,788) | (5,695,766)
Deferred Tax Assets, Net of Valuation Allowance | 0 | 0
Deferred tax liabilities: |  |
Property and equipment | 205,827 | 129,041
Intangible assets | 819,066 | 1,786,200
Deferred Tax Liabilities, Gross | 1,024,893 | 1,915,241
Net deferred tax liability | $ 1,024,893 | $ 1,915,241

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