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6 Cash and cash equivalents (Details Narrative) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
CashAndCashEquivalentLineItems [Line Items]    
Cash equivalents (a) R$ 987,313 R$ 930,117
U.S. dollars    
CashAndCashEquivalentLineItems [Line Items]    
Cash equivalents (a) R$ 70,523 R$ 2,529
Bank Certificates of Deposit [member]    
CashAndCashEquivalentLineItems [Line Items]    
Percentage of average interest   99.22%
Interbank Certificates Of Deposit [member]    
CashAndCashEquivalentLineItems [Line Items]    
Percentage of average interest 90.95%