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Accounts payable and accrued expenses:
 12 Months Ended
Dec. 31, 2017
Trade and other payables [abstract]  
Disclosure of trade and other payables [text block]
Note 10 - Accounts payable and accrued expenses:
 
At December 31, 2016 and 2017, the balances are as follows:
 
 
 
December 31,
 
 
 
 
 
 
 
 
 
 
 
2016
 
2017
 
 
 
 
 
 
 
 
 
Suppliers
 
Ps
11,401
 
Ps
428,881
 
Taxes payable
 
 
116,643
 
 
157,387
 
Use rights of assets under concession
 
 
109,437
 
 
127,076
 
Accounts payable to related parties (Note 15.1)
 
 
71,725
 
 
87,951
 
Salaries payable
 
 
71,022
 
 
111,984
 
Sundry creditors for services provided
 
 
94,349
 
 
583,059
 
Interest payable of the Bank Loans (Note 12)
 
 
 
 
 
340,288
 
Accounts payable to contractors
 
 
657
 
 
265,236
 
 
 
 
 
 
 
 
 
Total
 
Ps
475,234
 
Ps
2,101,862
 
 
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.