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12 Financial assets and financial liabilities (Details 3) - Cross-Currency Interest Rate Swap Agreements [member] - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of redesignated financial assets and liabilities [line items]    
Net position - assets (liabilities) R$ (757)
Current assets (liabilities) (757)
Noncurrent assets (liabilities)
Liability Position [member]    
Disclosure of redesignated financial assets and liabilities [line items]    
Cross-currency interest rate swap 128% of CDI  
Principal amount (notional) R$ (49,165)  
Net position - assets (liabilities)   (53,802)
Asset Position [member]    
Disclosure of redesignated financial assets and liabilities [line items]    
Cross-currency interest rate swap Euros + 1.01% p.y.  
Principal amount (notional) R$ 49,165  
Net position - assets (liabilities)   R$ 53,045