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18. Share capital and additional paid-in capital (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]    
Beginning balance $ 28,336,120 $ 28,264,898
Payment of other reserve constitution - share-bases compensation plan 16,295 71,222
Ending balance 28,352,415 28,336,120
Share Capital    
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]    
Beginning balance 27,982,570 27,982,570
Payment of other reserve constitution - share-bases compensation plan (146) 0
Ending balance 27,982,424 27,982,570
Additional Paid-in Capital    
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]    
Beginning balance 353,550 282,328
Payment of other reserve constitution - share-bases compensation plan 16,441 71,222
Ending balance $ 369,991 $ 353,550