Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2020-12-31 |
As at 2020-01-01 |
As at 2019-12-31 |
As at 2019-01-01 |
|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||
| Property, plant and equipment [abstract] | ||||
| Machinery |
1,063,000
EUR
|
— |
1,506,000
EUR
|
— |
| Fixtures and fittings |
2,903,000
EUR
|
— |
2,555,000
EUR
|
— |
| Property, plant and equipment |
47,650,000
EUR
|
— |
55,650,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | ||||
| Intangible assets other than goodwill [abstract] | ||||
| Computer software |
11,471,000
EUR
|
— |
13,348,000
EUR
|
— |
| Goodwill |
61,367,000
EUR
|
— |
61,178,000
EUR
|
— |
| Intangible assets and goodwill |
95,725,000
EUR
|
— |
99,557,000
EUR
|
— |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||||
| Investments in associates reported in separate financial statements |
881,000
EUR
|
— |
808,000
EUR
|
— |
| Trade and other non-current receivables [abstract] | ||||
| Trade and other non-current receivables |
82,513,000
EUR
|
— |
81,804,000
EUR
|
— |
| Miscellaneous non-current assets [abstract] | ||||
| Non-current investments other than investments accounted for using equity method | — | — | — | — |
| Long-term deposits |
2,031,000
EUR
|
— |
2,095,000
EUR
|
— |
| Other non-current assets |
7,489,000
EUR
|
— |
8,260,000
EUR
|
— |
| Trade and other current receivables [abstract] | ||||
| Current prepayments and current accrued income other than current contract assets [abstract] | ||||
| Current prepayments [abstract] | ||||
| Current prepayments |
7,292,000
EUR
|
— |
6,675,000
EUR
|
— |
| Current prepayments and current accrued income including current contract assets [abstract] | ||||
| Current accrued income including current contract assets [abstract] | ||||
| Current contract assets |
175,928,000
EUR
|
— |
151,774,000
EUR
|
— |
| Cash and cash equivalents [abstract] | ||||
| Cash and cash equivalents |
53,051,000
EUR
|
31,851,000
EUR
|
31,851,000
EUR
|
47,500,000
EUR
|
| Borrowings [abstract] | ||||
| Current borrowings and current portion of non-current borrowings [abstract] | ||||
| Current borrowings | — | — |
20,000,000
EUR
|
— |
| Trade and other current payables [abstract] | ||||
| Current trade payables |
17,747,000
EUR
|
— |
18,503,000
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 |
26,231,000
EUR
|
— |
24,678,000
EUR
|
— |
| Other current payables |
59,158,000
EUR
|
— |
48,922,000
EUR
|
— |
| Issued capital [abstract] | ||||
| Issued capital |
5,441,000
EUR
|
— |
5,441,000
EUR
|
— |
| Retained earnings [abstract] | ||||
| Retained earnings |
237,409,000
EUR
|
— |
186,643,000
EUR
|
— |
| Accumulated other comprehensive income [abstract] | ||||
| Reserve of exchange differences on translation |
4,725,000
EUR
|
— |
1,983,000
EUR
|
— |
| Net assets (liabilities) [abstract] | ||||
| Assets |
470,842,000
EUR
|
— |
437,912,000
EUR
|
— |
| Liabilities |
192,592,000
EUR
|
— |
207,892,000
EUR
|
— |
| Net current assets (liabilities) [abstract] | ||||
| Current assets |
319,978,000
EUR
|
— |
274,445,000
EUR
|
— |
| Current liabilities |
118,603,000
EUR
|
— |
127,580,000
EUR
|
— |
| Assets less current liabilities [abstract] |