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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | The components of income (loss) before income taxes are as follows:
|  | Years Ended December 31 |
|  | 2016 |  | 2015 |  | 2014 |
Foreign (not subject to income taxes) |  | $ | 8,851,332 |  | $ | 10,502,379 |  | $ | 10,355,689 |
Mexico |  |  | (3,339,932) |  |  | (2,576,885) |  |  | (3,591,149) |
United States |  |  | (3,270,144) |  |  | - |  |  | - |
|  | $ | 2,241,256 |  | $ | 7,925,494 |  | $ | 6,764,540 |
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 year ended December 31, 2016 is as follows:
U.S. statutory federal rate |  | 34.0 | %
State taxes, net of federal effect |  | (2.0) | %
Foreign tax rate differential |  | (128.3) | %
Permanent items |  | 20.9 | %
Valuation allowance for deferred tax assets |  | 51.4 | %
|  | (23.9) | %
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, 2016 were as follows:
Deferred tax assets: |  |  |  |
Operating loss carryforwards - Mexico |  | $ | 5,545,008 |
Operating loss carryforwards - United States |  |  | 150,758 |
Valuation allowances |  |  | (5,695,766) |
|  |  | - |
Deferred tax liabilities: |  |  |  |
Property and equipment |  |  | 129,041 |
Intangible assets |  |  | 1,786,200 |
|  |  | 1,915,241 |
Net deferred tax liability |  | $ | 1,915,241 |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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