Financial investments (Details Text) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Investment [Line Items]
Financial investments	R$ 782,647	R$ 979,837
Financial assets, average return percentage.	100.00%
Unrealized gains (losses) on investments	R$ 271	R$ (278)
Brazilian Treasury Bonds [Member]
Investment [Line Items]
Financial assets, average return percentage.	100.00%
Brazilian Treasury Bonds [Member] \| Selic Interest Rate
Investment [Line Items]
Financial Assets Interest Rate	9.25%	2.00%

The fair value gains (losses) recognised in other comprehensive income on financial assets reclassified out of the available-for-sale category. [Refer: Financial assets available-for-sale; Other comprehensive income]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 12A
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_12A_d&doctype=Standard&book=b
-URIDate 2021-03-24

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration