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Disclosure on Individual Items of the Consolidated Financial Statements - Schedule of Cost of Goods Sold (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cost of goods sold [Member]      
Schedule of Cost of Goods Sold [Line Items]      
Cost of materials € 25,967 € 72,568 € 95,007
Personnel expenses 10,619 10,714 9,623
Depreciation and amortization 9,490 5,711 4,082
Other expenses 1,767 1,593 1,558
Total 47,842 90,585 110,270
Research and development expenses [Member]      
Schedule of Cost of Goods Sold [Line Items]      
Personnel expenses 6,904 6,695 1,083
Material expenses 111 66 153
Depreciation and amortization 320 317 247
External development service provider 579 1,335 607
Other expenses 575 559 743
Total € 8,488 € 8,971 € 2,832