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Cash and short-term deposits (Details) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Borrowings        
Cash and cash equivalents € 19,099 € 35,951 € 17,818 € 48,156
Secured bank loan        
Borrowings        
Short term deposits pledged as security 425 443    
Existing Overdraft facility        
Borrowings        
Short term deposits pledged as security 0 2,500    
Maximum borrowing capacity 500      
Second Overdraft facility        
Borrowings        
Short term deposits pledged as security € 500 € 1,000