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8. Related Parties (Details 4)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2017
BRL (R$)
shares
R$ / shares
SummaryOfRelatedPartiesLineItems [Line Items]  
Balance of number of shares granted | shares 166,270
Total grant costs, including taxes R$ 18,543
Accumulated recognized grant costs (784)
Accumulated unrecognized grant costs R$ 17,759
Restricted  
SummaryOfRelatedPartiesLineItems [Line Items]  
Grant date 1-Oct-17
Balance of number of shares granted | shares 120,000
Vesting period 2023
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 76.38
Total grant costs, including taxes R$ 12,642
Accumulated recognized grant costs (527)
Accumulated unrecognized grant costs R$ 12,115
Restricted and Performance  
SummaryOfRelatedPartiesLineItems [Line Items]  
Grant date 8-Nov-17
Balance of number of shares granted | shares 46,270
Vesting period 2020 to 2022
Market price of shares on the grant date (in R$ per share) | R$ / shares R$ 76.38
Total grant costs, including taxes R$ 5,901
Accumulated recognized grant costs (257)
Accumulated unrecognized grant costs R$ 5,644