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] | ||||
| Property, plant and equipment |
110,340,000
EUR
|
— |
119,459,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | ||||
| Intangible assets other than goodwill [abstract] | ||||
| Intangible assets other than goodwill |
1,265,000
EUR
|
— |
1,609,000
EUR
|
— |
| Investment property [abstract] | ||||
| Investment property |
400,000
EUR
|
— |
400,000
EUR
|
— |
| Investments accounted for using equity method [abstract] | ||||
| Investments in joint ventures accounted for using equity method |
33,000
EUR
|
— |
94,000
EUR
|
— |
| Trade and other current receivables [abstract] | ||||
| Current trade receivables |
43,661,000
EUR
|
— |
45,242,000
EUR
|
— |
| Current prepayments and current accrued income other than current contract assets [abstract] | ||||
| Current prepayments [abstract] | ||||
| Current prepayments |
1,307,000
EUR
|
— |
803,000
EUR
|
— |
| Current prepayments and current accrued income including current contract assets [abstract] | ||||
| Current accrued income including current contract assets [abstract] | ||||
| Current contract assets |
29,555,000
EUR
|
— |
13,345,000
EUR
|
— |
| Classes of current inventories [abstract] | ||||
| Current inventories |
375,000
EUR
|
— |
312,000
EUR
|
— |
| Classes of current inventories, alternative [abstract] | ||||
| Cash and cash equivalents [abstract] | ||||
| Cash and cash equivalents |
2,645,000
EUR
|
1,579,000
EUR
|
1,579,000
EUR
|
505,000
EUR
|
| Borrowings [abstract] | ||||
| Non-current portion of non-current borrowings |
-
EUR
|
— |
22,872,000
EUR
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | ||||
| Trade and other current payables [abstract] | ||||
| Current trade payables |
63,438,000
EUR
|
— |
37,733,000
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 |
14,319,000
EUR
|
— |
17,625,000
EUR
|
— |
| Current payables on social security and taxes other than income tax | — | — | — | — |
| Current value added tax payables |
5,482,000
EUR
|
— |
1,731,000
EUR
|
— |
| Miscellaneous non-current liabilities [abstract] | ||||
| Other non-current liabilities |
1,484,000
EUR
|
— |
1,487,000
EUR
|
— |
| Miscellaneous current liabilities [abstract] | ||||
| Other current liabilities |
3,720,000
EUR
|
— |
11,850,000
EUR
|
— |
| Issued capital [abstract] | ||||
| Issued capital |
5,100,000
EUR
|
— |
5,100,000
EUR
|
— |
| Retained earnings [abstract] | ||||
| Retained earnings |
80,316,000
EUR
|
— |
74,828,000
EUR
|
— |
| Miscellaneous equity [abstract] | ||||
| Additional paid-in capital |
1,059,000
EUR
|
— |
1,059,000
EUR
|
— |
| Net assets (liabilities) [abstract] | ||||
| Assets |
241,847,000
EUR
|
— |
241,987,000
EUR
|
— |
| Liabilities |
147,577,000
EUR
|
— |
155,290,000
EUR
|
— |
| Net current assets (liabilities) [abstract] | ||||
| Current assets |
77,558,000
EUR
|
— |
63,677,000
EUR
|
— |
| Current liabilities |
95,681,000
EUR
|
— |
76,389,000
EUR
|
— |
| Assets less current liabilities [abstract] |