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Disclosure on Individual Items of the Consolidated Financial Statements - Schedule of Development of Fixed Assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cost [Member]    
Cost    
Beginning balance € 11,349 € 10,397
Additions 2,883 1,280
Disposals (589) (342)
Reclassification
Effect of movements in exchange rates (39) 13
Ending balance 13,603 11,349
Cost [Member] | Property, plant and equipment [Member]    
Cost    
Beginning balance 11,269 10,225
Additions 1,233 1,200
Disposals (587) (342)
Reclassification 78 172
Effect of movements in exchange rates (39) 13
Ending balance 11,954 11,269
Cost [Member] | Construction in progress [Member]    
Cost    
Beginning balance 80 172
Additions 1,649 80
Disposals (2)
Reclassification (78) (172)
Effect of movements in exchange rates
Ending balance 1,649 80
Depreciation [Member]    
Cost    
Beginning balance (5,154) (4,006)
Additions (1,347) (1,379)
Disposals 506 233
Effect of movements in exchange rates 5 (1)
Ending balance (5,990) (5,154)
Depreciation [Member] | Property, plant and equipment [Member]    
Cost    
Beginning balance (5,154) (4,006)
Additions (1,347) (1,379)
Disposals 506 233
Effect of movements in exchange rates 5 (1)
Ending balance (5,990) (5,154)
Depreciation [Member] | Construction in progress [Member]    
Cost    
Beginning balance
Additions
Disposals
Effect of movements in exchange rates
Ending balance
Carrying amounts [Member]    
Cost    
Beginning balance 6,195 6,391
Ending balance 7,614 6,195
Carrying amounts [Member] | Property, plant and equipment [Member]    
Cost    
Beginning balance 6,115 6,219
Ending balance 5,964 6,115
Carrying amounts [Member] | Construction in progress [Member]    
Cost    
Beginning balance 80 172
Ending balance € 1,649 € 80