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Marketable securities (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Marketable securities    
Marketable securities R$ 245,942 R$ 380,514
Average gross yield of securities 102.00% 104.00%
Credit Risk | AAA    
Marketable securities    
Private investment fund R$ 245,942 R$ 31,842
Credit Risk | AA    
Marketable securities    
Private investment fund R$ 0 R$ 348,672