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Salaries and other employee expenses - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2008 shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Restricted shares, charged against income |  | $ 474,000 | $ 354,000 | $ 401,000
Restricted shares to directors |  | 931,000 | 895,000 | 924,000
Cost pending amortization |  | $ 821,000 |  |
Duration of amortization of restricted cash |  | 2 years 3 months 29 days |  |
Vested shares, fair value |  | $ 730,000 | 1,800,000 | 949,000
Percentage of vesting of restricted share |  | 25.00% |  |
Amortization cost, restricted shares |  | $ 2,400,000 | 749,000 | 984,000
Weighted average fair value at measurement date, share options vested |  | 2,400,000 | 581,000 | 838,000
Balance outstanding, restricted shares |  | $ 1,600,000 |  |
Duration of amortization of restricted cash |  | 2 years 2 months 1 day |  |
Provision of restricted stock units |  | $ 1,700,000 |  |
Wages and salaries |  | $ 20,837,000 | $ 18,135,000 | $ 13,803,000
“Class E” |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Granted (in shares) |  | 63,000 | 57,000 | 63,000
Key management personnel of entity or parent |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Value of granted restricted share options |  | $ 4,600,000 | $ 822,000 | $ 1,000,000
Wages and salaries |  | 58,000 | 62,000 | 67,000
Maximum of the year | Key management personnel of entity or parent | “Class E” |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Number of shares to be granted | shares | 3,000,000 |  |  |
Restricted Stocks |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Fair value, restricted shares granted |  | $ 1,100,000 | $ 835,000 | $ 923,000
Restricted Stocks | Key management personnel of entity or parent |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Granted (in shares) | shares |  | 298,951 | 63,056 | 75,796
share-based payment arrangements, Tranche two | Restricted Stocks |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Percent of award vesting rights for share-based payment arrangement |  | 35.00% |  |
share-based payment arrangements, Tranche three | Restricted Stocks |  |  |  |
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |  |
Percent of award vesting rights for share-based payment arrangement |  | 30.00% |  |

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