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Shareholders' Equity (Share Option Plan) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2020
Apr. 30, 2020
May 02, 2019
Oct. 21, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Capital gains tax   25.00%      
Value of shares authorized under one-year share repurchase plan       $ 15  
Share Option Plan 2013 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized         500,000
Additional shares authorized 600,000        
Board of Directors [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Value of shares authorized under one-year share repurchase plan     $ 15