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5 Risk management (Details Narrative) R$ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 BRL (R$)
RiskManagementLineItems [Line Items] |  |  |
Total exposure | R$ 3,563,170 |  | R$ 6,382,009
Effects on profit for the year before taxes | R$ 141,854 |  | R$ 92,242
Leverage ratio | 37.00% | 37.00% | 34.00%
Financial instrument assets receivables from related parties | R$ 806,645 |  | R$ 850,896
Reimbursement of additional retirement and pension plan | R$ 732,391 |  | 747,579
Percentage of decrease in currency due to debt | 44.20% | 44.20% |
Liabilities related to exchange rate variation of borrowings and financing contracts | R$ 2,247,544 |  | 288,678
Income before taxes | R$ 356,317 |  | R$ 638,201
Description of currency exposure | Considering the other variables as remaining constant, the impacts for the next 12 months are shown in scenarios II and III with possible depreciations of 25% and 50%, respectively, in the Brazilian real. | Considering the other variables as remaining constant, the impacts for the next 12 months are shown in scenarios II and III with possible depreciations of 25% and 50%, respectively, in the Brazilian real. |
BID 2202 contract [member] |  |  |
RiskManagementLineItems [Line Items] |  |  |
Exchange of foreign currency | R$ 2,810,907 |  |
USD |  |  |
RiskManagementLineItems [Line Items] |  |  |
Depreciation | 28.90% | 28.90% |
USD | BID 2202 contract [member] |  |  |
RiskManagementLineItems [Line Items] |  |  |
Exchange of foreign currency | $ |  | $ 494,617 |
Yen |  |  |
RiskManagementLineItems [Line Items] |  |  |
Depreciation | 35.70% | 35.70% |
Eurobonds [member] |  |  |
RiskManagementLineItems [Line Items] |  |  |
Final amortization of Eurobonds | R$ 1,910,124 |  |
Eurobonds [member] | USD |  |  |
RiskManagementLineItems [Line Items] |  |  |
Final amortization of Eurobonds | $ |  | $ 357,763 |
Banco BV [member] |  |  |
RiskManagementLineItems [Line Items] |  |  |
Current accounts and investment funds | R$ 253,066 |  |

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