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Financial Instruments (Schedule of Significant Exchange Rates) (Details)
 12 Months Ended
Dec. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
USD [Member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Spot price of 1 Euro at the reporting date 1.00  
1 Euro [Member] | USD [Member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
% of change 9.30% (2.00%)
Spot price of 1 Euro at the reporting date 1.227 1.122
1 Euro [Member] | NIS [Member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
% of change 1.70% (9.60%)
Spot price of 1 Euro at the reporting date 3.944 3.878