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7 Trade receivables (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable R$ 342,924 R$ 150,003
1 To 30 Days [member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable 44,365 15,042
More Than 180 Days [member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable 44,764 16,102
31 To 90 Days [member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable 57,198 27,221
91 To 180 Days [member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable 51,521 20,543
Neither Past Due Nor Impaired [member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivable R$ 145,076 R$ 71,095