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Basis of preparation (Tables)
12 Months Ended
Dec. 31, 2024
Notes and other explanatory information [abstract]  
Schedule of effect of change in foreign exchange rate
                       
U.S. Dollar / Brazilian Real Dec/24 Sep/24 Jun/24 Mar/24 Dec/23 Sep/23 Jun/23 Mar/23 Dec/22 Sep/22 Jun/22 Mar/22
Quarterly average exchange rate 5.84 5.55 5.21 4.95 4.96 4.88 4.95 5.20 5.26 5.25 4.93 5.23
Period-end exchange rate 6.19 5.45 5.56 5.00 4.84 5.01 4.82 5.08 5.22 5.41 5.24 4.74