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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