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Notes to the consolidated balance sheet - Shareholders' equity - Share capital (Details) - EUR (€)
6 Months Ended
Jun. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Shareholders' equity        
Share capital € 9,366,000      
Shareholders' equity € 69,727,000 € (7,667,000) € 45,476,000 € 88,866,000
Number of shares outstanding 42,134,169      
Nominal value € 0.01      
Share capital        
Shareholders' equity        
Shareholders' equity € 421,000 € 421,341 € 421,341 409,000
Number of shares outstanding   42,134,169 42,134,169  
Nominal value   € 0.01 € 0.01  
Premiums related to share capital        
Shareholders' equity        
Share capital 9,354,000      
Shareholders' equity € 173,893,000 € 173,885,665 € 173,885,665 € 165,072,000