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31. Net Operating Revenue (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfLeaseAndRentalRevenueLineItems [Line Items]      
Lease and rental revenue R$ 132,682 R$ 109,230 R$ 103,793
Equipment and framework      
DisclosureOfLeaseAndRentalRevenueLineItems [Line Items]      
Lease and rental revenue 131,409 106,790 103,490
Facilities sharing      
DisclosureOfLeaseAndRentalRevenueLineItems [Line Items]      
Lease and rental revenue 1,003 2,159 248
Real estate      
DisclosureOfLeaseAndRentalRevenueLineItems [Line Items]      
Lease and rental revenue R$ 270 R$ 281 R$ 55