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17. Borrowings and financing (Details 4) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 BRL (R$)
17th issue - series 1 |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Amount | R$ 144,391 |
Maturity | 15-Jan-18 |
Interest rates | CDI |
17th issue - series 2 |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Amount | R$ 348,434 |
Maturity | 15-Feb-18 |
Interest rates | IPCA |
20th issue |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Amount | R$ 250,000 |
Maturity | 20-Dec-18 |
Interest rates | CDI |
10th issue |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Amount | R$ 42,438 |
Maturity | 2018 | [1]
Interest rates | TJLP/IPCA |
12th issue |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Amount | R$ 45,450 |
Maturity | 2018 | [1]
Interest rates | TR |
14th issue |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Amount | R$ 40,726 |
Maturity | 2018 | [1]
Interest rates | TJLP/IPCA |
18th issue |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Amount | R$ 33,641 |
Maturity | 2018 | [1]
Interest rates | TJLP/IPCA |
[1] | Amounts paid during the year.

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- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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