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Accounts payable and accrued expenses:
 12 Months Ended
Dec. 31, 2018
Trade and other payables [abstract]  
Disclosure of trade and other payables [text block]
Note 10 - Accounts payable and accrued expenses:
 
At December 31, 2017 and 2018, the balances are as follows:
 
 
 
December 31,
 
 
 
 
 
 
 
 
 
 
2017
 
 
2018
 
 
 
 
 
 
 
 
Suppliers
 
Ps
428,881
 
 
Ps
313,574
 
Taxes payable
 
 
157,387
 
 
 
230,196
 
Use rights of assets under concession
 
 
127,076
 
 
 
247,729
 
Accounts payable to related parties (Note 15.1)
 
 
87,951
 
 
 
97,332
 
Salaries payable
 
 
111,984
 
 
 
127,289
 
Sundry creditors for services provided
 
 
583,059
 
 
 
810,973
 
Accounts payable to contractors
 
 
265,236
 
 
 
44,331
 
 
 
 
 
 
 
 
 
 
Total
 
Ps
1,761,574
 
 
Ps
1,871,424
 
 
Due to the fact that these accounts mature at a term of under one year, their fair value is considered to approximate their book value.