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Basis of preparation (Details)
3 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Notes and other explanatory information [abstract]                        
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