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5. Financial risk management (Details 6) - ARS ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets $ 3,381,550 $ 4,278,008
Liabilities 1,035 291
Derivative financial instruments    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Liabilities 1,035 291
Level 1    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 3,381,550 4,278,008
Liabilities 0 0
Level 1 | Derivative financial instruments    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Liabilities 0 0
Level 2    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 0 0
Liabilities 1,035 291
Level 2 | Derivative financial instruments    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Liabilities 1,035 291
Level 3    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 0 0
Liabilities 0 0
Level 3 | Derivative financial instruments    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Liabilities 0 0
Government bonds    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 3,285,799 1,829,888
Government bonds | Level 1    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 3,285,799 1,829,888
Government bonds | Level 2    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 0 0
Government bonds | Level 3    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 0 0
Money market funds    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 95,751 2,448,120
Money market funds | Level 1    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 95,751 2,448,120
Money market funds | Level 2    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets 0 0
Money market funds | Level 3    
SummaryOfFinancialRiskManagementLineItems [Line Items]    
Assets $ 0 $ 0