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Notes to the consolidated balance sheet - Free share awards (Details)
6 Months Ended 12 Months Ended
May 25, 2023
Jun. 30, 2023
EUR (€)
shares
Jun. 30, 2022
EUR (€)
Dec. 31, 2022
€ / shares
Notes to the consolidated balance sheet        
Share based payment expense | €   € 2,000,000.0    
Bonus Share Award Plans [Member]        
Notes to the consolidated balance sheet        
Outstanding, Beginning balance   790,600    
Issued   300,000    
Forfeited/ Lapsed   (11,500)    
Outstanding, Ending balance   1,079,100   790,600
AGA 2021-1        
Notes to the consolidated balance sheet        
Stock price at grant date (in euros)       € 11.30
Outstanding, Beginning balance   340,800    
Outstanding, Ending balance   340,800   340,800
AGA 2021-bis        
Notes to the consolidated balance sheet        
Stock price at grant date (in euros)       € 12.20
Outstanding, Beginning balance   76,800    
Forfeited/ Lapsed   (4,000)    
Outstanding, Ending balance   72,800   76,800
AGA 2022        
Notes to the consolidated balance sheet        
Stock price at grant date (in euros)       € 4.18
Outstanding, Beginning balance   373,000    
Forfeited/ Lapsed   (7,500)    
Outstanding, Ending balance   365,500   373,000
AGA Plan 2023-1        
Notes to the consolidated balance sheet        
Stock price at grant date (in euros)       € 2.60
Issued 300,000 300,000    
Outstanding, Ending balance   300,000    
Number of shares per AGA | shares   1    
Fair value per AGA at grant date | €   € 2.60    
Vesting and holding period (year)   4 years    
Share based payment expense | €     € 1,600,000  
PAGUP        
Notes to the consolidated balance sheet        
Issued   300,000    
Outstanding, Ending balance   300,000    
PAGUP 2023        
Notes to the consolidated balance sheet        
Stock price at grant date (in euros)       € 2.60
Issued 300,000 300,000    
Outstanding, Ending balance   300,000    
Number of shares per AGA | shares   1    
Fair value per AGA at grant date | €   € 2.60    
Vesting and holding period (year)   4 years    
Period to become eligible for free allotment of shares 1 year