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Intangible assets (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Intangible assets |  |  |
Intangible assets at beginning of period | € 29,973 | € 31,464 | € 37,875
Intangible assets at end of period | 25,639 | 29,973 | 31,464
Gross carrying amount |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | 75,593 | 71,125 | 72,552
Additions | 2,220 | 1,871 | 3,018
Acquisition of a subsidiary |  | 3,060 |
Disposals | (934) | (289) | (4,680)
Transfer between accounts | 33 | 0 | (16)
Currency translation | (288) | (173) | 252
Assets held for sale | (426) |  |
Intangible assets at end of period | 76,199 | 75,593 | 71,125
Accumulated depreciation and amortisation |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | (45,619) | (39,661) | (34,676)
Amortization charge for the year | (6,431) | (6,389) | (6,504)
Impairment loss of intangible assets |  | (46) | (2,915)
Disposals | 813 | 289 | 4,636
Transfer between accounts |  | 0 |
Currency translation | 288 | 187 | (202)
Assets held for sale | 390 |  |
Intangible assets at end of period | (50,560) | (45,619) | (39,661)
Patents and licenses |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | 1,794 | 1,786 | 2,086
Intangible assets at end of period | 1,721 | 1,794 | 1,786
Patents and licenses | Gross carrying amount |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | 7,768 | 7,239 | 6,915
Additions | 470 | 315 | 327
Acquisition of a subsidiary |  | 122 |
Disposals | (529) | (11) | (132)
Transfer between accounts | 41 | 102 | 129
Currency translation | (1) | 1 | 0
Assets held for sale | (1) |  |
Intangible assets at end of period | 7,749 | 7,768 | 7,239
Patents and licenses | Accumulated depreciation and amortisation |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | (5,973) | (5,453) | (4,829)
Amortization charge for the year | (485) | (531) | (755)
Disposals | 428 | 11 | 132
Transfer between accounts |  | 0 |
Currency translation | 0 |  | 0
Assets held for sale | 1 |  |
Intangible assets at end of period | (6,029) | (5,973) | (5,453)
Software |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | 4,999 | 7,316 | 1,879
Intangible assets at end of period | 2,578 | 4,999 | 7,316
Software | Gross carrying amount |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | 17,830 | 16,649 | 12,679
Additions | 330 | 79 | 1,006
Disposals | (388) | (278) | (4,504)
Transfer between accounts | 1,410 | 1,413 | 7,458
Currency translation | (3) | (33) | 11
Assets held for sale | (424) |  |
Intangible assets at end of period | 18,754 | 17,830 | 16,649
Software | Accumulated depreciation and amortisation |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | (12,830) | (9,333) | (10,799)
Amortization charge for the year | (4,122) | (3,763) | (3,027)
Impairment loss of intangible assets |  | (46) |
Disposals | 385 | 278 | 4,504
Transfer between accounts |  | 0 |
Currency translation | 3 | 33 | (10)
Assets held for sale | 389 |  |
Intangible assets at end of period | (16,176) | (12,830) | (9,333)
Acquired customers, technology and order backlog |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | 22,746 | 21,887 | 27,474
Intangible assets at end of period | 20,923 | 22,746 | 21,887
Acquired customers, technology and order backlog | Gross carrying amount |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | 47,472 | 44,673 | 44,431
Additions | 48 |  |
Acquisition of a subsidiary |  | 2,938 |
Transfer between accounts | (48) |  |
Currency translation | (284) | (139) | 241
Intangible assets at end of period | 47,188 | 47,472 | 44,673
Acquired customers, technology and order backlog | Accumulated depreciation and amortisation |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | (24,726) | (22,785) | (16,957)
Amortization charge for the year | (1,823) | (2,095) | (2,722)
Impairment loss of intangible assets |  |  | (2,915)
Currency translation | 284 | 154 | (191)
Intangible assets at end of period | (26,265) | (24,726) | (22,785)
Developed technology and software under construction |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | 433 | 474 | 6,437
Intangible assets at end of period | 418 | 433 | 474
Developed technology and software under construction | Gross carrying amount |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | 2,523 | 2,564 | 8,527
Additions | 1,371 | 1,477 | 1,685
Disposals | (17) |  | (45)
Transfer between accounts | (1,369) | (1,516) | (7,603)
Currency translation | 0 | (2) |
Intangible assets at end of period | 2,508 | 2,523 | 2,564
Developed technology and software under construction | Accumulated depreciation and amortisation |  |  |
Intangible assets |  |  |
Intangible assets at beginning of period | (2,090) | (2,090) | (2,090)
Intangible assets at end of period | € (2,090) | € (2,090) | € (2,090)

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