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Shareholders' Equity - Bonus share award plans (Details)
12 Months Ended
Dec. 31, 2020
EUR (€)
shares
Dec. 31, 2019
plan
Dec. 31, 2018
Jan. 01, 2020
plan
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Issued   10,000    
AGA        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of plans outstanding | plan   2   4
Bonus share award plans        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Issued   283,500 341,400  
AGA 2017-1        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 2 years      
Issued 92,300      
Holding period (year) 1 year      
Number of shares per AGA | shares 1      
Fair value per share at grant date () | € € 7.04      
AGA 2018        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of plans outstanding | plan       2
AGA 2018-1        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 1 year      
Issued 10,000   10,000  
Holding period (year) 1 year      
Number of shares per AGA | shares 1      
Fair value per share at grant date () | € € 5.54      
AGA 2018-2        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 2 years      
Issued 65,700   65,700  
Holding period (year) 1 year      
Number of shares per AGA | shares 1      
Fair value per share at grant date () | € € 5.54      
AGA 2018-3        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 2 years      
Issued 265,700   265,700  
Holding period (year) 1 year      
Number of shares per AGA | shares 1      
Fair value per share at grant date () | € € 6.05      
AGA 2019 plans        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of plans outstanding | plan       2
AGA 2019-1        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 2 years      
Issued 37,500 37,500    
Holding period (year) 1 year      
Number of shares per AGA | shares 1      
Fair value per share at grant date () | € € 1.92      
AGA 2019-2        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 1 year      
Issued 246,000 246,000    
Holding period (year) 1 year      
Number of shares per AGA | shares 1      
Fair value per share at grant date () | € € 1.92