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Trade and Other Receivables (Details) - EUR (€)
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Trade and Other Receivables.        
Trade receivables from non-related parties € 51,467,000 € 26,802,000 € 17,635,000  
Contract assets 37,609,000 8,880,000 19,999,000 € 843,000
Receivables from related parties 214,000 592,000    
Other receivables 11,305,000 3,158,000 600,000  
Trade and Other Receivables € 100,595,000 € 39,432,000 € 38,234,000