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6. Inventories (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventories Details 1      
Provisions for losses, beginning R$ 47,271 R$ 33,992 R$ 46,325
Additions (reversals) to net realizable value adjustment (6,713) 12,393 2,003
Reversals of obsolescence and other losses (3,459)   (14,336)
Additions to obsolescence and other losses   886  
Provisions for losses, ending R$ 37,099 R$ 47,271 R$ 33,992