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Cash and cash equivalents (Details Narrative) - BRL (R$)
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]    
Cash equivalents (a) R$ 660,075,000 R$ 987,313,000
U S D [Member]    
IfrsStatementLineItems [Line Items]    
Cash equivalents (a) R$ 23,228 R$ 70,523
Bank Certificates Of Deposit [Member]    
IfrsStatementLineItems [Line Items]    
Percentage of average interest 100.38%  
Interbank Certificates Of Deposit [Member]    
IfrsStatementLineItems [Line Items]    
Percentage of average interest   90.95%