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Financial Instruments (Schedule of Significant Exchange Rates) (Details)
 12 Months Ended
Dec. 31, 2019
$ / shares
₪ / shares
Dec. 31, 2018
$ / shares
₪ / 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 (2.00%) (4.40%)
Spot price of 1 Euro at the reporting date | $ / shares 1.122 1.145
1 Euro [Member] | NIS [Member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
% of change (9.60%) 3.30%
Spot price of 1 Euro at the reporting date | ₪ / shares 3.878 4.292