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Shareholders' Equity (Share Option Plan) (Details) - shares
1 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2018
Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Capital gains tax   25.00%  
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