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15. Property, plant and equipment (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |
Property, plant, and equipment, beginning | R$ 302,383 | R$ 325,076 | R$ 304,845
Additions | 18,920 | 27,631 | 54,794
Transfers | (14,697) | (13,803) | (3,092)
Write-offs and disposals | (279) | (236) | (373)
Depreciation | (51,277) | (36,285) | (31,098)
Property, plant, and equipment, ending | 255,050 | 302,383 | 325,076
Land |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |
Property, plant, and equipment, beginning | 92,494 | 102,708 | 100,533
Additions | 0 | 0 | 1,032
Transfers | 13 | (10,214) | 1,143
Write-offs and disposals | 0 | 0 | 0
Depreciation | 0 | 0 | 0
Property, plant, and equipment, ending | 92,507 | 92,494 | 102,708
Buildings |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |
Property, plant, and equipment, beginning | 43,262 | 45,891 | 42,515
Additions | 86 | 0 | 1,383
Transfers | 1,358 | (911) | 3,347
Write-offs and disposals | 0 | (45) | 0
Depreciation | (2,346) | (1,673) | (1,354)
Property, plant, and equipment, ending | 42,360 | 43,262 | 45,891
Equipment |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |
Property, plant, and equipment, beginning | 149,140 | 162,218 | 146,922
Additions | 17,627 | 26,061 | 51,610
Transfers | (15,945) | (6,380) | (8,123)
Write-offs and disposals | (178) | (181) | (340)
Depreciation | (46,841) | (32,578) | (27,851)
Property, plant, and equipment, ending | 103,803 | 149,140 | 162,218
Transportation |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |
Property, plant, and equipment, beginning | 4,531 | 5,692 | 7,613
Additions | 0 | 214 | 135
Transfers | (33) | (556) | (1,109)
Write-offs and disposals | (27) | 0 | (10)
Depreciation | (791) | (819) | (937)
Property, plant, and equipment, ending | 3,680 | 4,531 | 5,692
Furniture and fixtures |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |
Property, plant, and equipment, beginning | 11,986 | 8,418 | 7,124
Additions | 1,207 | 511 | 634
Transfers | (75) | 4,258 | 1,629
Write-offs and disposals | (54) | (10) | (23)
Depreciation | (1,248) | (1,191) | (946)
Property, plant, and equipment, ending | 11,816 | 11,986 | 8,418
Other |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |
Property, plant, and equipment, beginning | 970 | 149 | 138
Additions | 0 | 845 | 0
Transfers | (15) | 0 | 21
Write-offs and disposals | (20) | 0 | 0
Depreciation | (51) | (24) | (10)
Property, plant, and equipment, ending | R$ 884 | R$ 970 | R$ 149

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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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 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount recognised resulting from the write-down of property, plant and equipment to its recoverable amount or reversals of those write-downs. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + Details
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