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Equity (Narrative) (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 07, 2021 USD ($) | Aug. 31, 2021 USD ($) | May 28, 2021 USD ($) | May 05, 2021 shares | Apr. 13, 2021 USD ($) | Mar. 10, 2021 shares | Nov. 12, 2020 USD ($) shares | Nov. 04, 2020 USD ($) shares | Apr. 08, 2020 USD ($) | Mar. 11, 2020 shares | Feb. 10, 2020 USD ($) $ / shares shares | Jan. 02, 2020 USD ($) shares | Dec. 10, 2019 USD ($) | Nov. 06, 2019 shares | Jul. 08, 2019 USD ($) shares | Jan. 02, 2019 USD ($) shares | Dec. 20, 2018 | Dec. 20, 2018 shares | Nov. 10, 2021 shares | Dec. 31, 2021 USD ($) item shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of treasury shares | $ |  |  |  |  |  |  |  | $ 938,000 |  |  | $ 3,071,000 |  |  |  |  |  |  |  |  | $ 11,841,000 |  | $ 71,272,000 | $ 1,801,000
Treasury Stock Purchased, Shares |  |  |  |  |  |  |  | 101,986 |  |  | 316,445 |  |  |  |  |  |  |  |  | 960,454 |  | 4,318,320 | 145,917
Percentage of number of shares repurchase |  |  |  |  |  |  |  | 10.00% |  |  | 10.00% |  |  |  |  |  | 10.00% |  |  |  |  |  |
Maximum shares can buyback |  |  |  |  |  |  |  | 6,062,000 |  |  | 5,930,000 |  |  |  |  |  |  | 6,063,000 |  |  |  |  |
Number of share options granted in share-based payment arrangement | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 279,818 |  |  |
Cash dividend per share |  |  |  | 0.0205 |  | 0.0205 |  | 0.0206 |  |  |  |  |  | 0.0413 |  |  |  |  | 0.041 |  |  |  |
Dividends paid | $ | $ 2,429,000 | $ 2,442,000 | $ 1,220,000 |  | $ 1,133,000 |  |  | $ 2,516,000 | $ 2,343,000 |  |  |  | $ 2,444,000 |  |  |  |  |  |  | $ 7,224,000 | $ 4,859,000 | $ 2,444,000 |
Stock dividend per share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.004 |  |  |  |  |  |  |  |  |  |  |  |
Dividend distributed during the period shares |  |  |  |  |  |  |  |  |  | 242,650 |  |  |  |  |  |  |  |  |  |  |  |  |
Share Capital [Member]. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,484,847 |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,352,000 |  |
Share Premium [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Premium, Common Shares Issued To Employees | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,311,000 |  |  |  |  |  |  |  |
Share premium, common shares issued to key management | $ |  |  |  |  |  |  |  |  |  |  |  | $ 4,668,000 |  |  |  | $ 4,668,000 |  |  |  |  |  |  |
Non Executive Directors [Member] | Share Capital [Member]. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during the period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,269 | 60,204 | 29,220 |
Non Executive Directors [Member] | Share Premium [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share premium, common shares issued to Non-Executive Directors | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 861,000 | $ 665,000 | $ 499,000 |
Employee Benefit Trust [Member] | Share Capital [Member]. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during the period |  |  |  |  |  |  | 499,614 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share capital | $ |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefit Trust [Member] | Share Premium [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Premium, Common Shares Issued To Employees | $ |  |  |  |  |  |  | $ 4,351,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management [Member] | Share Capital [Member]. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during the period |  |  |  |  |  |  |  |  |  |  |  | 2,976,781 |  |  |  | 2,976,781 |  |  |  |  |  |  |
Director | Share Capital [Member]. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during the period |  |  |  |  |  |  |  |  |  |  |  | 878,150 |  |  |  | 878,150 |  |  |  |  |  |  |
Value Creation Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation arrangement shares vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |
Director | Value Creation Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Share capital [Line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares under share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |

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