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11 Contract assets (Details Narrative) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
ContractAssetsLineItems [Line Items] |  |  |
Costs of borrowings, financing and debentures capitalized | R$ 9,537 | R$ 6,838 | R$ 5,435
Percentage of average rate | 0.38% | 0.28% | 0.26%
RBSE Assets [member] |  |  |
ContractAssetsLineItems [Line Items] |  |  |
Impact of the tariff review | R$ 122,027 |  |

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