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6 Bonds and Securities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]    
Bonds and securities R$ 282,081 R$ 344,296
Bonds and securities, current 3,112 124,862
Bonds and securities, noncurrent 278,969 219,434
Committed Operation [Member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities R$ 3,632 6,116
Index 96.5% to 100% of CDI  
Bank Deposit Certificates - CDB [Member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities R$ 50,216 50,629
Index 95.0% to 101% of CDI  
Financial Treasury Bonds - LFT [Member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities R$ 733 696
Index Selic  
National Treasury Bills - LTN [Member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities R$ 1,696  
Index CDI  
Quotas in Funds [Member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities [1] R$ 225,804 R$ 286,855
Index [1] CDI  
[1] These are fixed income funds in the Parent Company and reserve accounts intended to comply with contracts with BNDES, in other companies.