Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2023-12-31 |
As at 2022-12-31 |
As at 2021-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
274,382,000
USD
|
252,414,000
USD
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
20,306,000
USD
|
18,963,000
USD
|
— |
| Trade and other current receivables [abstract] | |||
| Current receivables from taxes other than income tax |
40,575,000
USD
|
37,576,000
USD
|
— |
| Trade and other current receivables |
10,689,000
USD
|
3,468,000
USD
|
— |
| Categories of non-current financial assets [abstract] | |||
| Non-current financial assets at fair value through profit or loss [abstract] | |||
| Non-current financial assets at fair value through profit or loss |
10,035,000
USD
|
42,000
USD
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
16,684,000
USD
|
19,590,000
USD
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash [abstract] | |||
| Cash |
152,984,000
USD
|
221,476,000
USD
|
— |
| Cash and cash equivalents |
152,984,000
USD
|
221,476,000
USD
|
218,249,000
USD
|
| Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] | |||
| Non-current assets or disposal groups classified as held for sale |
-
USD
|
9,000,000
USD
|
— |
| Miscellaneous current assets [abstract] | |||
| Current investments |
14,076,000
USD
|
55,566,000
USD
|
— |
| Trade and other current payables [abstract] | |||
| Current payables on social security and taxes other than income tax |
1,184,000
USD
|
1,221,000
USD
|
— |
| Trade and other current payables |
27,456,000
USD
|
33,966,000
USD
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
11,298,000
USD
|
10,874,000
USD
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current dividend payables |
41,000
USD
|
32,000
USD
|
— |
| Issued capital [abstract] | |||
| Issued capital |
15,504,000
USD
|
15,504,000
USD
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
826,656,000
USD
|
722,191,000
USD
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
341,639,000
USD
|
289,434,000
USD
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
1,087,000
USD
|
1,087,000
USD
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets (liabilities) |
530,672,000
USD
|
583,977,000
USD
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
259,596,000
USD
|
356,959,000
USD
|
— |
| Current liabilities |
31,932,000
USD
|
45,522,000
USD
|
— |
| Current assets (liabilities) |
227,664,000
USD
|
311,437,000
USD
|
— |
| Assets less current liabilities [abstract] |