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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | The components of income (loss) before income taxes for the years ended December 31 are as follows:
|  | Year Ended December 31, |
|  | 2017 |  | 2016 |  | 2015 |
Foreign (not subject to income taxes) |  | $ | 10,041,971 |  | $ | 8,851,332 |  | $ | 10,502,379 |
Mexico |  |  | (3,188,134) |  |  | (3,339,932) |  |  | (2,576,885) |
United States |  |  | (2,010,241) |  |  | (3,270,144) |  |  | - |
|  | $ | 4,843,596 |  | $ | 2,241,256 |  | $ | 7,925,494 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The Company's provision for income taxes for the years ended December 31, 2017 and 2016 consisted of a deferred tax benefit relating to U.S. operations made up of the following:
|  | Year Ended December 31, |
|  | 2017 |  | 2016 |
Current tax expense |  | $ | 1,371 |  | $ | - |
Deferred tax benefit |  |  | (890,348) |  |  | (536,057) |
|  | $ | (888,977) |  | $ | (536,057) |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | A reconciliation of the U.S. statutory federal tax rate to the effective benefit rate for the U.S. loss before income taxes for the years ended December 31, 2017 and 2016 is as follows:
|  | Year Ended December 31, |
|  | 2017 |  | 2016 |
U.S. statutory federal rate |  |  | 34.00 | % |  | 34.00 | %
State taxes, net of federal effect |  |  | 2.00 |  |  | (2.00) |
Foreign tax rate differential |  |  | (82.91) |  |  | (128.30) |
R&D tax credit |  |  | (2.49) |  |  | 0.00 |
Permanent items |  |  | 13.39 |  |  | 20.90 |
Tax Act adjustment |  |  | (11.25) |  |  | 0.00 |
Valuation allowance for deferred tax assets |  |  | 28.90 |  |  | 51.40 |
|  |  | (18.36) | % |  | (24.00) | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | The tax effects of significant items comprising the Company's net long-term deferred tax liability at December 31, 2017 and 2016 were as follows:
|  | December 31, |
|  | 2017 |  | 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 |  |  | - |  |  | 150,758 |
Valuation allowances |  |  | (6,372,788) |  |  | (5,695,766) |
|  |  | - |  |  | - |
Deferred tax liabilities: |  |  |  |  |  |  |
Property and equipment |  |  | 205,827 |  |  | 129,041 |
Intangible assets |  |  | 819,066 |  |  | 1,786,200 |
|  |  | 1,024,893 |  |  | 1,915,241 |
Net deferred tax liability |  | $ | 1,024,893 |  | $ | 1,915,241 |

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