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Intangible assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
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)