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Cash and cash equivalents (Details Narrative) - BRL (R$)	Dec. 31, 2021	Dec. 31, 2020
IfrsStatementLineItems [Line Items]
Cash equivalents (a)	R$ 660,075,000	R$ 987,313,000
U S D [Member]
IfrsStatementLineItems [Line Items]
Cash equivalents (a)	R$ 23,228	R$ 70,523
Bank Certificates Of Deposit [Member]
IfrsStatementLineItems [Line Items]
Percentage of average interest	100.38%
Interbank Certificates Of Deposit [Member]
IfrsStatementLineItems [Line Items]
Percentage of average interest		90.95%

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- References

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The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2021-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard
-URIDate 2021-03-24

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