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6. Bonds and Securities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
DisclosureOfBondsAndSecuritiesLineItems [Line Items]    
Bonds and securities R$ 344,296 R$ 219,663
Bonds and securities, current 124,862 1,341
Bonds and securities, noncurrent 219,434 218,322
Quotas in Funds    
DisclosureOfBondsAndSecuritiesLineItems [Line Items]    
Bonds and securities R$ 286,856 114,732
Index CDI  
Bank Deposit Certificates - CDB    
DisclosureOfBondsAndSecuritiesLineItems [Line Items]    
Bonds and securities R$ 50,629 57,192
Index 95.0% to 101% of CDI  
Committed Operation    
DisclosureOfBondsAndSecuritiesLineItems [Line Items]    
Bonds and securities R$ 6,116 47,052
Index 96.5% to 98% of CDI  
Financial Treasury Bonds - LFT    
DisclosureOfBondsAndSecuritiesLineItems [Line Items]    
Bonds and securities R$ 696 R$ 687
Index Selic