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16. Borrowings and financing (Details Narrative) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 BRL (R$) R$ / $ R$ / ¥ | Dec. 31, 2016 BRL (R$) R$ / $ R$ / ¥ | Jul. 13, 2017 BRL (R$)
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Debentures | R$ 6,223 | R$ 8,163 |
Guaranteed | R$ 225,900 |  |
Currency appreciation USD | 1.50% |  |
Debt reduced, currency appreciation USD | R$ 58,718 |  |
Currency appreciation YEN | 5.30% |  |
Debt reduced, currency appreciation YEN | R$ 85,211 |  |
US Dollar |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Exchange rate | R$ / $ | 3.3080 | 3.2591 |
Yen |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Exchange rate | R$ / ¥ | .02940 | .02792 |
17th issue |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Amortized principal and interest | R$ 140,144 |  |
15th issue |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Amortized principal and interest | 104,809 |  |
19th debenture issue |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Amortized principal and interest | 212,648 |  |
21st debenture issue |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Unsecured debentures, not convertible into share |  |  | R$ 500,000
BNDES |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Debentures | 2,793 | R$ 3,517 |
Eurobonds |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Debentures | 2,470 | 3,290 |
Deutsche Bank |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Debentures | 5,757 | 8,621 |
BID |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Debentures | 14,517 | 12,770 |
JICA |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Debentures | 3,100 | 2,971 |
AB Loan |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Debentures | 3,400 | 4,641 |
IBRD |  |  |
SummaryOfBorrowingsAndFinancingLineItems [Line Items] |  |  |
Debentures | R$ 310 | R$ 328 |

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