Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | |||
| Property, plant and equipment [abstract] | |||
| Property, plant and equipment |
127,492,000
EUR
|
126,330,000
EUR
|
— |
| Intangible assets and goodwill [abstract] | |||
| Intangible assets other than goodwill [abstract] | |||
| Intangible assets other than goodwill |
844,000
EUR
|
1,260,000
EUR
|
— |
| Investments accounted for using equity method [abstract] | |||
| Investments accounted for using equity method |
1,626,000
EUR
|
2,641,000
EUR
|
— |
| Trade and other non-current receivables [abstract] | |||
| Other non-current receivables |
529,000
EUR
|
506,000
EUR
|
— |
| Trade and other current receivables [abstract] | |||
| Current trade receivables |
3,756,000
EUR
|
4,662,000
EUR
|
— |
| Current receivables due from related parties |
1,811,000
EUR
|
1,137,000
EUR
|
— |
| Current prepayments and current accrued income other than current contract assets [abstract] | |||
| Current prepayments [abstract] | |||
| Current prepaid expenses |
268,000
EUR
|
260,000
EUR
|
— |
| Other current receivables |
5,327,000
EUR
|
1,467,000
EUR
|
— |
| Current prepayments and current accrued income including current contract assets [abstract] | |||
| Current accrued income including current contract assets [abstract] | |||
| Current contract assets |
1,131,000
EUR
|
1,025,000
EUR
|
— |
| Classes of current inventories [abstract] | |||
| Current inventories |
2,197,000
EUR
|
1,010,000
EUR
|
— |
| Classes of current inventories, alternative [abstract] | |||
| Cash and cash equivalents [abstract] | |||
| Cash and cash equivalents |
32,506,000
EUR
|
9,893,000
EUR
|
12,406,000
EUR
|
| Miscellaneous current assets [abstract] | |||
| Current restricted cash and cash equivalents |
3,629,000
EUR
|
4,109,000
EUR
|
— |
| Classes of other provisions [abstract] | |||
| Other provisions [abstract] | |||
| Other non-current provisions |
545,000
EUR
|
520,000
EUR
|
— |
| Borrowings [abstract] | |||
| Non-current portion of non-current borrowings |
41,106,000
EUR
|
44,143,000
EUR
|
— |
| Current borrowings and current portion of non-current borrowings [abstract] | |||
| Current portion of non-current borrowings |
4,354,000
EUR
|
6,008,000
EUR
|
— |
| Non-current portion of non-current borrowings, by type [abstract] | |||
| Current borrowings and current portion of non-current borrowings, by type [abstract] | |||
| Current bonds issued and current portion of non-current bonds issued |
24,107,000
EUR
|
0
EUR
|
— |
| Borrowings, by type [abstract] | |||
| Bonds issued |
57,223,000
EUR
|
46,739,000
EUR
|
— |
| Trade and other current payables [abstract] | |||
| Current trade payables |
2,275,000
EUR
|
3,630,000
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 |
423,000
EUR
|
836,000
EUR
|
— |
| Other current payables |
2,202,000
EUR
|
3,593,000
EUR
|
— |
| Miscellaneous non-current liabilities [abstract] | |||
| Other non-current liabilities |
373,000
EUR
|
401,000
EUR
|
— |
| Issued capital [abstract] | |||
| Issued capital |
600,000
EUR
|
600,000
EUR
|
— |
| Retained earnings [abstract] | |||
| Retained earnings |
24,680,000
EUR
|
22,098,000
EUR
|
— |
| Accumulated other comprehensive income [abstract] | |||
| Revaluation surplus |
40,251,000
EUR
|
40,679,000
EUR
|
— |
| Reserve of exchange differences on translation |
2,022,000
EUR
|
2,580,000
EUR
|
— |
| Reserve of cash flow hedges |
2,039,000
EUR
|
325,000
EUR
|
— |
| Miscellaneous equity [abstract] | |||
| Statutory reserve |
13,000
EUR
|
13,000
EUR
|
— |
| Net assets (liabilities) [abstract] | |||
| Assets |
196,618,000
EUR
|
158,904,000
EUR
|
— |
| Liabilities |
145,080,000
EUR
|
118,790,000
EUR
|
— |
| Net current assets (liabilities) [abstract] | |||
| Current assets |
54,155,000
EUR
|
23,851,000
EUR
|
— |
| Current liabilities |
33,958,000
EUR
|
15,166,000
EUR
|
— |
| Assets less current liabilities [abstract] |