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7. Interest in joint venture (Details) - ARS ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
SummaryOfInterestsInJointVenturesLineItems [Line Items]    
Equity attributable to the owners $ 8,844 $ 10,693
SACME    
SummaryOfInterestsInJointVenturesLineItems [Line Items]    
Percentage interest held in capital stock and votes 50.00%  
Equity attributable to the owners $ 8,844 $ 10,693