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12 Financial assets and financial liabilities (Details 10) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of redesignated financial assets and liabilities [line items]      
Cash and cash equivalents R$ (101,833) R$ (880,949) R$ (36,770)
Increase in Foreign Currency Sensitivity +10% [Member] | Foreign Currency Risk [Member]      
Disclosure of redesignated financial assets and liabilities [line items]      
Cash and cash equivalents   7,052  
Decrease in Foreign Currency Sensitivity -10% [Member] | Foreign Currency Risk [Member]      
Disclosure of redesignated financial assets and liabilities [line items]      
Cash and cash equivalents   (7,052)  
Exposure [Member] | Foreign Currency Risk [Member]      
Disclosure of redesignated financial assets and liabilities [line items]      
Cash and cash equivalents   R$ 70,523