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Trade receivables (Details) - EUR (€)
€ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Trade receivables      
Trade receivables € 54,938 € 53,052 € 52,698
Gross carrying amount      
Trade receivables      
Trade receivables 55,906 53,718 53,505
Allowance for doubtful accounts      
Trade receivables      
Trade receivables € (968) € (667) € (807)