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8 Related parties (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related party transactions [abstract]      
Short-term employee benefits R$ 9,629 R$ 4,947 R$ 2,681
Share-based compensation plans 23,989 13,893 2,161
Total R$ 33,618 R$ 18,840 R$ 4,842