Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2022-12-31 |
As at 2022-01-01 |
As at 2021-12-31 |
As at 2021-01-01 |
|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||
| Property, plant and equipment [abstract] | ||||
| Machinery |
851,000
EUR
|
— |
860,000
EUR
|
— |
| Fixtures and fittings |
2,349,000
EUR
|
— |
2,737,000
EUR
|
— |
| Property, plant and equipment |
41,459,000
EUR
|
— |
43,692,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | ||||
| Intangible assets other than goodwill [abstract] | ||||
| Computer software |
8,132,000
EUR
|
— |
9,801,000
EUR
|
— |
| Goodwill |
61,266,000
EUR
|
— |
61,645,000
EUR
|
— |
| Intangible assets and goodwill |
88,984,000
EUR
|
— |
92,691,000
EUR
|
— |
| Investments accounted for using equity method [abstract] | ||||
| Investments in associates accounted for using equity method |
827,000
EUR
|
— |
909,000
EUR
|
— |
| Miscellaneous non-current assets [abstract] | ||||
| Other non-current assets |
11,942,000
EUR
|
— |
10,966,000
EUR
|
— |
| Trade and other current receivables [abstract] | ||||
| Current prepayments and current accrued income other than current contract assets [abstract] | ||||
| Current prepayments [abstract] | ||||
| Current prepayments |
10,636,000
EUR
|
— |
11,668,000
EUR
|
— |
| Trade and other current receivables |
112,378,000
EUR
|
— |
96,543,000
EUR
|
— |
| Current prepayments and current accrued income including current contract assets [abstract] | ||||
| Current accrued income including current contract assets [abstract] | ||||
| Current contract assets |
292,903,000
EUR
|
— |
221,000,000
EUR
|
— |
| Cash and cash equivalents [abstract] | ||||
| Cash and cash equivalents |
40,546,000
EUR
|
47,692,000
EUR
|
47,692,000
EUR
|
53,051,000
EUR
|
| Borrowings [abstract] | ||||
| Current borrowings and current portion of non-current borrowings [abstract] | ||||
| Current borrowings |
6,724,000
EUR
|
— | — | — |
| Trade and other current payables [abstract] | ||||
| Current trade payables |
33,351,000
EUR
|
— |
29,126,000
EUR
|
— |
| Current accruals and current deferred income including current contract liabilities [abstract] | ||||
| Current deferred income including current contract liabilities [abstract] | ||||
| Current contract liabilities [abstract] | ||||
| Current contract liabilities |
35,975,000
EUR
|
— |
31,239,000
EUR
|
— |
| Other current payables |
51,079,000
EUR
|
— |
49,993,000
EUR
|
— |
| Issued capital [abstract] | ||||
| Issued capital |
5,441,000
EUR
|
— |
5,441,000
EUR
|
— |
| Retained earnings [abstract] | ||||
| Retained earnings |
333,459,000
EUR
|
— |
280,003,000
EUR
|
— |
| Accumulated other comprehensive income [abstract] | ||||
| Reserve of exchange differences on translation |
3,075,000
EUR
|
— |
2,225,000
EUR
|
— |
| Net assets (liabilities) [abstract] | ||||
| Assets |
604,328,000
EUR
|
— |
526,312,000
EUR
|
— |
| Liabilities |
228,771,000
EUR
|
— |
203,205,000
EUR
|
— |
| Net current assets (liabilities) [abstract] | ||||
| Current assets |
461,943,000
EUR
|
— |
378,963,000
EUR
|
— |
| Current liabilities |
143,606,000
EUR
|
— |
128,253,000
EUR
|
— |
| Assets less current liabilities [abstract] |