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Financial instruments-fair values and risk management - Sensitivity analysis (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financial instruments-fair values and risk management    
Earnings before tax, 5% increase € 31 € (94)
Earnings before tax, 5% decrease (34) 104
Equity, 5% increase 31 (94)
Equity, 5% decrease € (34) € 104