Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
252,414,000
USD
|
260,532,000
USD
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
42,000
USD
|
49,000
USD
|
— |
| Trade and other non-current receivables [abstract] | |||
| Trade and other non-current receivables |
18,963,000
USD
|
22,000,000
USD
|
— |
| Trade and other current receivables [abstract] | |||
| Current receivables from taxes other than income tax |
37,576,000
USD
|
45,435,000
USD
|
— |
| Trade and other current receivables |
3,468,000
USD
|
5,182,000
USD
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
19,590,000
USD
|
14,316,000
USD
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
221,476,000
USD
|
218,249,000
USD
|
115,21 1
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 or as held for distribution to owners |
9,000,000
USD
|
13,210,000
USD
|
— |
| Miscellaneous current assets [abstract] | |||
| Current investments |
55,566,000
USD
|
1,439,000
USD
|
— |
| Trade and other non-current payables [abstract] | |||
| Non-current payables on social security and taxes other than income tax |
1,221,000
USD
|
1,615,000
USD
|
— |
| Trade and other current payables [abstract] | |||
| Trade and other current payables |
33,966,000
USD
|
32,533,000
USD
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Non-current net defined benefit liability |
10,874,000
USD
|
11,499,000
USD
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Current dividend payables |
32,000
USD
|
25,000
USD
|
— |
| Issued capital [abstract] | |||
| Issued capital |
15,504,000
USD
|
15,504,000
USD
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
712,919,000
USD
|
642,582,000
USD
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Reserve of exchange differences on translation |
288,891,000
USD
|
241,907,000
USD
|
— |
| Miscellaneous equity [abstract] | |||
| Capital redemption reserve |
1,087,000
USD
|
1,087,000
USD
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets (liabilities) |
572,978,000
USD
|
542,108,000
USD
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
356,959,000
USD
|
315,694,000
USD
|
— |
| Current liabilities |
45,522,000
USD
|
47,552,000
USD
|
— |
| Current assets (liabilities) |
311,437,000
USD
|
268,142,000
USD
|
— |
| Assets less current liabilities [abstract] |