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6. Bonds and Securities (Tables)
12 Months Ended
Dec. 31, 2018
Bonds And Securities Tables Abstract  
Bonds and Securities
       
Category Index 12.31.2018 12.31.2017
Quotas in Funds  CDI  286,856  114,732
Bank Deposit Certificates - CDB  95.0% to 101% of CDI  50,629  57,192
Committed Operation 96.5% to 98% of CDI  6,116  47,052
Financial Treasury Bonds - LFT  Selic  696  687
     344,296  219,663
  Current  124,862  1,341
  Noncurrent  219,435  218,322
Interbank Deposit Certificate - CDI      
Interest rate equivalent to the reference rate of the Special System for Settlement and Custody - Selic