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6 Cash and cash equivalents (Details Narrative) - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CashAndCashEquivalentLineItems [Line Items]
Cash equivalents (a)	R$ 987,313	R$ 930,117
U.S. dollars
CashAndCashEquivalentLineItems [Line Items]
Cash equivalents (a)	R$ 70,523	R$ 2,529
Bank Certificates of Deposit [member]
CashAndCashEquivalentLineItems [Line Items]
Percentage of average interest		99.22%
Interbank Certificates Of Deposit [member]
CashAndCashEquivalentLineItems [Line Items]
Percentage of average interest	90.95%

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2020-01-01
-Paragraph 45
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-URIDate 2020-01-01

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