Cash and cash equivalents (Details) - BRL (R$) R$ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Notes and other explanatory information [abstract] | ||
| Cash and banks | R$ 85,873 | R$ 81,177 |
| Unrestrictedly available financial investments: | ||
| CDB | 3,524,451 | 3,177,566 |
| Total cash and cash equivalents | R$ 3,610,324 | R$ 3,258,743 |