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Financial risk management: (Tables) | 12 Months Ended
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Dec. 31, 2018
Financial risk management [Abstract] |
Disclosure of effect of changes in foreign exchange rates [text block] | At December 31, 2017 and 2018, the Company is exposed to exchange rate risk for monetary position, as shown in the next page:
|  | December 31, |
|  | 2017 |  |  | 2018 |
Monetary position: |  |  |  |  |  |  |  |
Asset |  | USD | 50,905 |  |  | USD | 45,003 |
Liability |  |  | (148,417 | ) |  |  | (3,149 | )
|  | USD | (97,512 | ) |  | USD | 41,854 |
Disclosure of maturity analysis for non-derivative financial liabilities [text block] | The amounts presented in the table reflect the undiscounted cash flows, including contractual interest:
|  | Under |  |  | Between 3 months |  |  | Between 1 |  |  | Between 2 and |
At December 31, 2017 |  | 3 months |  |  | and one year |  |  | and 2 years |  |  | 5 years |
Bank loans and interest |  | Ps | 177,080 |  |  | Ps | 606,433 |  |  | Ps | 880,357 |  |  | Ps | 12,146,826 |
Long-term debt |  |  | 337,107 |  |  |  | 317,789 |  |  |  | 633,140 |  |  |  | 11,442,620 |
Suppliers |  |  | 428,881 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | 1,175,306 |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Under |  |  | Between 3 months |  |  | Between 1 |  |  | Between 2 and |
At December 31, 2018 |  | 3 months |  |  | and one year |  |  | and 2 years |  |  | 5 years |
Bank loans and interest |  | Ps | 14,506 |  |  | Ps | 161,009 |  |  | Ps | 212,959 |  |  | Ps | 6,829,639 |
Long-term debt |  |  | 119,680 |  |  |  | 204,910 |  |  |  | 208,027 |  |  |  | 6,749,651 |
Suppliers |  |  | 313,577 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | 1,557,847 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about working capital of entity [Text Block] | The following table shows the Company’s short-term liquidity as of:
|  | December 31, |
|  | 2017 |  |  | 2018 |
Current assets |  | Ps | 5,787,862 |  |  | Ps | 6,000,912 |
Current liabilities |  |  | 2,408,649 |  |  |  | 2,408,222 |
Short term position (liquidity) |  | Ps | 3,379,213 |  |  | Ps | 3,592,690 |

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