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16. Property, plant and equipment (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | R$ 585,179 | R$ 538,687 |  |
Accumulated amortization | (317,567) | (283,637) |  |
Net | 267,612 | 255,050 | R$ 302,383 | R$ 325,076
Land |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 92,979 | 92,507 |  |
Accumulated amortization | 0 | 0 |  |
Net | 92,979 | 92,507 | 92,494 | 102,708
Buildings |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 79,086 | 79,013 |  |
Accumulated amortization | (38,961) | (36,653) |  |
Net | 40,125 | 42,360 | 43,262 | 45,891
Equipment |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 372,872 | 330,753 |  |
Accumulated amortization | (256,786) | (226,950) |  |
Net | 116,086 | 103,803 | 149,140 | 162,218
Transportation |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 11,333 | 10,862 |  |
Accumulated amortization | (7,860) | (7,182) |  |
Net | 3,473 | 3,680 | 4,531 | 5,692
Furniture and fixtures |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 27,250 | 24,430 |  |
Accumulated amortization | (13,672) | (12,614) |  |
Net | 13,578 | 11,816 | 11,986 | 8,418
Other |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 1,659 | 1,122 |  |
Accumulated amortization | (288) | (238) |  |
Net | R$ 1,371 | R$ 884 | R$ 970 | R$ 149

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of property, plant and equipment that would have been recognised had the revalued assets been carried under the cost model. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 77 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_77_e&doctype=Standard -URIDate 2018-03-16 + Details
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