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Shareholders' Equity (Schedule Of Restricted Share Units Activity) (Details) - RSUs [Member] - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Number of Restricted Share Units        
Restricted Share Units, beginning balance 86,000 39,000 78,000  
Restricted Share Units, granted 86,000   78,000
Restricted Share Units, vested   (39,000) (39,000)  
Restricted Share Units, ending balance 86,000 86,000 39,000  
Weighted average grant date fair value        
Weighted average grant date fair value, granted   $ 35.33    
Weighted average grant date fair value, vested   $ 34.43 $ 35.36