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Shareholders' Equity (Share Option Plan) (Details) - USD ($) $ in Millions | 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 |  |

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