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17. Borrowings and financing (Details Narrative) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 BRL (R$) R$ / $ R$ / ¥ | Dec. 31, 2017 BRL (R$) R$ / $ R$ / ¥
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Debentures | R$ 5,590 | R$ 6,223
Guaranteed | R$ 225,900 |
Currency appreciation USD | 17.10% |
Debt increase (decrease), currency appreciation USD | R$ 675,145 |
Currency appreciation YEN | 20.00% |
Debt increase (decrease), currency appreciation YEN | R$ 337,309 |
US$ |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Exchange rate | R$ / $ | 3.8748 | 3.3080
Yen |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Exchange rate | R$ / ¥ | 0.03527 | 0.02940
BNDES |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Debentures | R$ 2,584 | R$ 2,793
Eurobonds |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Debentures | 1,648 | 2,470
Deutsche Bank |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Debentures | 2,131 | 5,757
BID |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Debentures | 15,999 | 14,517
JICA |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Debentures | 3,113 | 3,100
AB Loan |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Debentures | 2,322 | 3,400
IBRD |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |
Debentures | R$ 290 | R$ 310

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds. + 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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