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6 Bonds and Securities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets [line items]    
Bonds and securities R$ 300,530 R$ 282,081
Bonds and securities, current 1,465 3,112
Bonds and securities, noncurrent 299,065 278,969
Bank deposit certificates - CDB [member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities R$ 62,638 50,216
Index 90% to 101% of CDI  
Committed operation [member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities 3,632
Index 96.5% of CDI  
Financial treasury bonds - LFT [member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities R$ 751 733
Index Selic  
National treasury bills - LTN [member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities 1,696
Index CDI  
Quotas in funds [member]    
Disclosure of fair value measurement of assets [line items]    
Bonds and securities [1] R$ 237,141 R$ 225,804
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.