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Cash and short-term deposits (Details) - EUR (€)
€ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Secured bank loan    
Borrowings    
Short term deposits pledged as security € 1,500 € 1,500
Existing Overdraft facility    
Borrowings    
Short term deposits pledged as security 2,500 2,500
Maximum borrowing capacity 2,500  
Second Overdraft facility    
Borrowings    
Short term deposits pledged as security 500 € 0
Maximum borrowing capacity € 500