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Transactions in Soles (Details Textual)
Dec. 31, 2018
Dec. 31, 2017
Purchased call options [member]    
Disclosure of Transactions in Soles [Line Items]    
Closing foreign exchange rate 0.2968 0.3088
Written put options [member]    
Disclosure of Transactions in Soles [Line Items]    
Closing foreign exchange rate 0.2959 0.3082