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Schedule of bonds and securities (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Bonds and securities R$ 361,058 R$ 300,530
Bonds and securities, current 16,121 1,465
Bonds and securities, noncurrent R$ 344,937 299,065
Quotas In Funds [Member]    
IfrsStatementLineItems [Line Items]    
Index  CDI   
Bonds and securities R$ 284,852 237,141
Bank Deposit Certificates [Member]    
IfrsStatementLineItems [Line Items]    
Index  82% to 101% of CDI   
Bonds and securities R$ 61,635 62,638
Financial Treasury Bonds [Member]    
IfrsStatementLineItems [Line Items]    
Index  Selic   
Bonds and securities R$ (0) 751
National Treasury Bills [Member]    
IfrsStatementLineItems [Line Items]    
Index  10.92% p.y.   
Bonds and securities R$ 14,571 R$ (0)