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 |
31,527,000
EUR
|
37,192,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
4,770,000
EUR
|
5,067,000
EUR
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | |||
| Investments in joint ventures reported in separate financial statements |
2,538,000
EUR
|
2,344,000
EUR
|
— |
| Miscellaneous non-current assets [abstract] | |||
| Other non-current assets |
204,000
EUR
|
16,000
EUR
|
— |
| Trade and other current receivables [abstract] | |||
| Current trade receivables |
16,697,000
EUR
|
16,206,000
EUR
|
— |
| Other current receivables |
2,236,000
EUR
|
6,556,000
EUR
|
— |
| Categories of non-current financial assets [abstract] | |||
| Non-current financial assets |
3,640,000
EUR
|
1,140,000
EUR
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
18,905,000
EUR
|
16,106,000
EUR
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
26,125,000
EUR
|
53,522,000
EUR
|
123,668,000
EUR
|
| Miscellaneous current assets [abstract] | |||
| Other current assets |
5,971,000
EUR
|
2,736,000
EUR
|
— |
| Miscellaneous assets [abstract] | |||
| Restricted cash and cash equivalents |
1,200,000
EUR
|
— | — |
| Trade and other non-current payables [abstract] | |||
| Non-current accruals and non-current deferred income including non-current contract liabilities [abstract] | |||
| Non-current deferred income including non-current contract liabilities [abstract] | |||
| Non-current deferred income including non-current contract liabilities |
149,000
EUR
|
313,000
EUR
|
— |
| Trade and other current payables [abstract] | |||
| Current trade payables |
11,747,000
EUR
|
11,560,000
EUR
|
— |
| Current accruals and current deferred income including current contract liabilities [abstract] | |||
| Current deferred income including current contract liabilities [abstract] | |||
| Current deferred income including current contract liabilities |
1,195,000
EUR
|
1,822,000
EUR
|
— |
| Miscellaneous current liabilities [abstract] | |||
| Other current liabilities |
8,910,000
EUR
|
8,445,000
EUR
|
— |
| Issued capital [abstract] | |||
| Issued capital |
220,302,000
EUR
|
220,657,000
EUR
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
443,363,000
EUR
|
526,405,000
EUR
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Accumulated other comprehensive income |
5,843,000
EUR
|
5,571,000
EUR
|
— |
| Miscellaneous equity [abstract] | |||
| Reserve of share-based payments |
7,502,000
EUR
|
6,862,000
EUR
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
114,277,000
EUR
|
142,480,000
EUR
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
69,934,000
EUR
|
95,126,000
EUR
|
— |
| Current liabilities |
42,449,000
EUR
|
33,705,000
EUR
|
— |
| Assets less current liabilities [abstract] |