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Financial instruments - Fair values and risk management (Details 3) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financial instruments and risk management    
Balance at beginning of period R$ (15,532) R$ 0
Recognized in other comprehensive income – future revenues denominated in U.S. dollar 11,591 (23,855)
Reclassified to the statements of profit or loss - revenues denominated in U.S. dollar 4,055 8,323
Reclassified to the statements of profit or loss - ineffective portion (2,443)  
Balance at end of period R$ (2,329) R$ (15,532)