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Cash and cash equivalents (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Notes and other explanatory information [abstract]        
Cash and banks R$ 31,784 R$ 31,187    
Cash equivalents 1,650,822 807,297    
Total R$ 1,682,606 R$ 838,484 R$ 1,867,485 R$ 717,929