18 Taxes recoverable/payable (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Summary of taxes recoverable payable [Line Items]
Current tax assets	R$ 22,672	R$ 141,266
Income tax and social contribution [member]
Summary of taxes recoverable payable [Line Items]
Current tax assets	0	136,436
Other federal taxes [member]
Summary of taxes recoverable payable [Line Items]
Current tax assets	18,281	3,471
Withholding income tax (IRRF) on financial investments [member]
Summary of taxes recoverable payable [Line Items]
Current tax assets	R$ 4,391	R$ 1,359

The excess of amount paid for current tax in respect of current and prior periods over the amount due for those periods. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 54
-Subparagraph n
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_n&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_CurrentTaxAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant