Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2021-12-31 |
As at 2021-12-31 |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||||
| Property, plant and equipment [abstract] | ||||||
| Property, plant and equipment |
13,366,000
EUR
|
13,295,000
EUR
|
13,653,000
EUR
|
13,499,000
EUR
|
— | — |
| Intangible assets and goodwill [abstract] | ||||||
| Intangible assets other than goodwill [abstract] | ||||||
| Intangible assets other than goodwill |
1,567,000
EUR
|
1,567,000
EUR
|
1,537,000
EUR
|
1,537,000
EUR
|
— | — |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||||||
| Investments in subsidiaries reported in separate financial statements |
-
EUR
|
424,000
EUR
|
-
EUR
|
424,000
EUR
|
— | — |
| Trade and other current receivables [abstract] | ||||||
| Current trade receivables |
4,247,000
EUR
|
4,181,000
EUR
|
3,966,000
EUR
|
3,943,000
EUR
|
— | — |
| Current prepayments and current accrued income other than current contract assets [abstract] | ||||||
| Current prepayments [abstract] | ||||||
| Current prepayments |
493,000
EUR
|
493,000
EUR
|
816,000
EUR
|
816,000
EUR
|
— | — |
| Other current receivables |
250,000
EUR
|
248,000
EUR
|
246,000
EUR
|
196,000
EUR
|
— | — |
| Current prepayments and current accrued income including current contract assets [abstract] | ||||||
| Classes of current inventories [abstract] | ||||||
| Current inventories |
6,142,000
EUR
|
6,127,000
EUR
|
4,135,000
EUR
|
4,081,000
EUR
|
— | — |
| Classes of current inventories, alternative [abstract] | ||||||
| Cash and cash equivalents [abstract] | ||||||
| Cash and cash equivalents |
129,000
EUR
|
53,000
EUR
|
309,000
EUR
|
249,000
EUR
|
98,000
EUR
|
138,000
EUR
|
| Borrowings [abstract] | ||||||
| Non-current portion of non-current borrowings |
8,005,000
EUR
|
8,005,000
EUR
|
8,411,000
EUR
|
8,405,000
EUR
|
— | — |
| Current borrowings and current portion of non-current borrowings [abstract] | ||||||
| Current borrowings and current portion of non-current borrowings |
2,502,000
EUR
|
2,502,000
EUR
|
764,000
EUR
|
746,000
EUR
|
— | — |
| Non-current portion of non-current borrowings, by type [abstract] | ||||||
| Current borrowings and current portion of non-current borrowings, by type [abstract] | ||||||
| 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 other than non-current contract liabilities | — | — | — | — | — | — |
| Non-current government grants |
289,000
EUR
|
289,000
EUR
|
392,000
EUR
|
392,000
EUR
|
— | — |
| Trade and other current payables [abstract] | ||||||
| Current trade payables |
8,204,000
EUR
|
8,229,000
EUR
|
5,881,000
EUR
|
5,813,000
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 advances received, representing current contract liabilities for performance obligations satisfied at point in time |
93,000
EUR
|
85,000
EUR
|
90,000
EUR
|
25,000
EUR
|
— | — |
| Miscellaneous non-current liabilities [abstract] | ||||||
| Other non-current liabilities |
-
EUR
|
-
EUR
|
30,000
EUR
|
30,000
EUR
|
— | — |
| Miscellaneous current liabilities [abstract] | ||||||
| Other current liabilities |
382,000
EUR
|
363,000
EUR
|
305,000
EUR
|
299,000
EUR
|
— | — |
| Issued capital [abstract] | ||||||
| Issued capital |
6,736,000
EUR
|
6,736,000
EUR
|
6,736,000
EUR
|
6,736,000
EUR
|
— | — |
| Retained earnings [abstract] | ||||||
| Retained earnings |
11,507,000
EUR
|
11,254,000
EUR
|
10,652,000
EUR
|
10,354,000
EUR
|
— | — |
| Accumulated other comprehensive income [abstract] | ||||||
| Revaluation surplus |
7,675,000
EUR
|
7,675,000
EUR
|
8,521,000
EUR
|
8,521,000
EUR
|
— | — |
| Reserve of exchange differences on translation |
52,000
EUR
|
-
EUR
|
54,000
EUR
|
-
EUR
|
— | — |
| Miscellaneous equity [abstract] | ||||||
| Statutory reserve |
718,000
EUR
|
674,000
EUR
|
991,000
EUR
|
946,000
EUR
|
— | — |
| Net assets (liabilities) [abstract] | ||||||
| Assets |
26,303,000
EUR
|
26,497,000
EUR
|
24,800,000
EUR
|
24,883,000
EUR
|
— | — |
| Liabilities |
22,733,000
EUR
|
22,666,000
EUR
|
19,258,000
EUR
|
19,034,000
EUR
|
— | — |
| Net current assets (liabilities) [abstract] | ||||||
| Current assets |
11,261,000
EUR
|
11,102,000
EUR
|
9,472,000
EUR
|
9,285,000
EUR
|
— | — |
| Current liabilities |
12,367,000
EUR
|
12,316,000
EUR
|
8,398,000
EUR
|
8,188,000
EUR
|
— | — |
| Assets less current liabilities [abstract] |