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Financial instruments-fair values and risk management - Sensitivity analysis (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Financial instruments-fair values and risk management    
Earnings before tax, 5% increase € (94) € (101)
Earnings before tax, 5% decrease 104 112
Equity, 5% increase (94) (101)
Equity, 5% decrease € 104 € 112