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18. Employee Benefits and Private Pension Plan (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfEmployeeBenefitsLineItems [Line Items]      
Employee benefit expense R$ 23,148 R$ 18,174 R$ 19,771
Health and dental care plan      
SummaryOfEmployeeBenefitsLineItems [Line Items]      
Employee benefit expense 164 3,065 3,291
FGTS Penalty      
SummaryOfEmployeeBenefitsLineItems [Line Items]      
Employee benefit expense 14,828 9,068 10,445
Bonus      
SummaryOfEmployeeBenefitsLineItems [Line Items]      
Employee benefit expense 6,883 4,455 4,352
Life Insurance      
SummaryOfEmployeeBenefitsLineItems [Line Items]      
Employee benefit expense R$ 1,543 R$ 1,586 R$ 1,683