Subclassifications Of Assets, Liabilities And Equities [Abstract]
| Concept |
As at 2020-12-31 |
As at 2020-12-31 |
As at 2019-12-31 |
As at 2019-12-31 |
As at 2018-12-31 |
As at 2018-12-31 |
|---|---|---|---|---|---|---|
| Subclassifications of assets, liabilities and equities [abstract] | ||||||
| Property, plant and equipment [abstract] | ||||||
| Property, plant and equipment |
417,136,694
EUR
|
403,335,743
EUR
|
364,056,975
EUR
|
378,579,903
EUR
|
— | — |
| Intangible assets and goodwill [abstract] | ||||||
| Intangible assets other than goodwill [abstract] | ||||||
| Intangible assets other than goodwill |
2,058,861
EUR
|
1,881,584
EUR
|
2,053,785
EUR
|
2,286,740
EUR
|
— | — |
| Investment property [abstract] | ||||||
| Investment property |
14,844,630
EUR
|
23,721,641
EUR
|
24,283,283
EUR
|
15,087,221
EUR
|
— | — |
| Investments in subsidiaries, joint ventures and associates reported in separate financial statements [abstract] | ||||||
| Investments in subsidiaries reported in separate financial statements |
0
EUR
|
4,533,063
EUR
|
4,533,063
EUR
|
0
EUR
|
— | — |
| Investments in associates reported in separate financial statements |
14,168,687
EUR
|
6,737,709
EUR
|
6,737,709
EUR
|
13,800,193
EUR
|
— | — |
| Trade and other non-current receivables [abstract] | ||||||
| Trade and other non-current receivables |
31,397
EUR
|
41,088
EUR
|
41,122
EUR
|
41,122
EUR
|
— | — |
| Miscellaneous non-current assets [abstract] | ||||||
| Non-current investments other than investments accounted for using equity method |
47,423,171
EUR
|
44,223,149
EUR
|
36,808,861
EUR
|
40,175,130
EUR
|
— | — |
| Other non-current assets |
1,089,144
EUR
|
1,089,144
EUR
|
17,752,840
EUR
|
17,853,040
EUR
|
— | — |
| Trade and other current receivables [abstract] | ||||||
| Trade and other current receivables |
41,632,400
EUR
|
41,192,593
EUR
|
43,342,836
EUR
|
43,828,727
EUR
|
— | — |
| Classes of current inventories [abstract] | ||||||
| Current inventories |
1,362,769
EUR
|
1,362,769
EUR
|
1,422,498
EUR
|
1,422,498
EUR
|
— | — |
| Classes of current inventories, alternative [abstract] | ||||||
| Cash and cash equivalents [abstract] | ||||||
| Cash and cash equivalents |
61,021,421
EUR
|
37,051,470
EUR
|
65,846,592
EUR
|
73,030,320
EUR
|
79,583,293
EUR
|
73,376,306
EUR
|
| Borrowings [abstract] | ||||||
| Non-current portion of non-current borrowings |
71,209,697
EUR
|
71,209,697
EUR
|
97,730,871
EUR
|
81,730,871
EUR
|
— | — |
| Current borrowings and current portion of non-current borrowings [abstract] | ||||||
| Current borrowings |
10,521,175
EUR
|
10,521,175
EUR
|
10,521,175
EUR
|
10,521,175
EUR
|
— | — |
| Non-current portion of non-current borrowings, by type [abstract] | ||||||
| Trade and other non-current payables [abstract] | ||||||
| Trade and other non-current payables |
145,939
EUR
|
115,195
EUR
|
933,707
EUR
|
965,934
EUR
|
— | — |
| Trade and other current payables [abstract] | ||||||
| Trade and other current payables |
39,734,303
EUR
|
38,832,869
EUR
|
35,813,153
EUR
|
36,573,045
EUR
|
— | — |
| Issued capital [abstract] | ||||||
| Issued capital |
58,420,965
EUR
|
58,420,965
EUR
|
58,420,965
EUR
|
58,420,965
EUR
|
— | — |
| Retained earnings [abstract] | ||||||
| Retained earnings |
62,982,777
EUR
|
30,637,829
EUR
|
30,013,664
EUR
|
61,607,313
EUR
|
— | — |
| Accumulated other comprehensive income [abstract] | ||||||
| Revaluation surplus |
20,507,185
EUR
|
20,382,176
EUR
|
14,581,468
EUR
|
14,948,315
EUR
|
— | — |
| Net assets (liabilities) [abstract] | ||||||
| Assets |
607,399,743
EUR
|
571,650,069
EUR
|
578,115,124
EUR
|
597,410,414
EUR
|
— | — |
| Net current assets (liabilities) [abstract] | ||||||
| Current assets |
104,973,095
EUR
|
80,494,435
EUR
|
114,785,854
EUR
|
122,490,937
EUR
|
— | — |
| Current liabilities |
50,638,269
EUR
|
49,684,712
EUR
|
46,740,936
EUR
|
47,605,935
EUR
|
— | — |
| Assets less current liabilities [abstract] |