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Notes to the consolidated balance sheet - Free share awards (Details)
6 Months Ended 12 Months Ended
May 25, 2023
May 25, 2023
shares
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   300,000 300,000 300,000    
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   300,000 300,000 300,000    
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