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Disclosure on Individual Items of the Consolidated Financial Statements - Schedule of Development of Intangible Assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cost [Member]    
Cost    
Beginning balance € 33,067 € 33,315
Additions 399 445
Disposals (11) (692)
Ending balance 33,456 33,067
Cost [Member] | Internally generated assets [Member]    
Cost    
Beginning balance 32,261 32,610
Additions 349 344
Disposals (692)
Ending balance 32,610 32,261
Cost [Member] | Software [Member]    
Cost    
Beginning balance 806 705
Additions 50 101
Disposals (11)
Ending balance 845 806
Amortization [Member]    
Cost    
Beginning balance (12,538) (8,274)
Additions (8,018) (4,264)
Disposals 11  
Ending balance (20,546) (12,538)
Amortization [Member] | Internally generated assets [Member]    
Cost    
Beginning balance (11,928) (7,818)
Additions (7,887) (4,111)
Disposals  
Ending balance (19,815) (11,928)
Amortization [Member] | Software [Member]    
Cost    
Beginning balance (610) (457)
Additions (131) (153)
Disposals 11  
Ending balance (731) (610)
Carrying amounts [Member]    
Cost    
Beginning balance 20,529 25,041
Ending balance 12,910 20,529
Carrying amounts [Member] | Internally generated assets [Member]    
Cost    
Beginning balance 20,333 24,793
Ending balance 12,795 20,333
Carrying amounts [Member] | Software [Member]    
Cost    
Beginning balance 196 248
Ending balance € 114 € 196