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6 Bonds and Securities (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of fair value measurement of assets [line items] |  |  |
Bonds and securities |  | R$ 300,530 | R$ 282,081
Bonds and securities, current |  | 1,465 | 3,112
Bonds and securities, noncurrent |  | 299,065 | 278,969
Bank deposit certificates - CDB [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Bonds and securities |  | R$ 62,638 | 50,216
Index |  | 90% to 101% of CDI |
Committed operation [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Bonds and securities |  |  | 3,632
Index |  | 96.5% of CDI |
Financial treasury bonds - LFT [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Bonds and securities |  | R$ 751 | 733
Index |  | Selic |
National treasury bills - LTN [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Bonds and securities |  |  | 1,696
Index |  | CDI |
Quotas in funds [member] |  |  |
Disclosure of fair value measurement of assets [line items] |  |  |
Bonds and securities | [1] | R$ 237,141 | R$ 225,804
Index | [1] | CDI |
[1] | These are fixed income funds in the Parent Company and reserve accounts intended to comply with contracts with BNDES, in other companies.

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