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Critical accounting judgments and key sources of estimation uncertainty: (Details Textual) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of changes in accounting estimates [abstract]    
Expected credit loss rate 15.00% 15.00%
Increase (decrease) through changes in models or risk parameters, financial assets $ 28 $ 19