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Investments in associates and results related to associates (Details)
1 Months Ended 3 Months Ended
May 31, 2021
Mar. 31, 2022
EUR (€)
director
Dec. 31, 2021
EUR (€)
Disclosure of associates [line items]      
Investments in associates     € 8,000
Results related to associates   € (8,000)  
Yarrow Biotechnology, Inc      
Disclosure of associates [line items]      
Proportion of ownership interest in associate 8.00% 5.10% 4.90%
Investments in associates   € 0 € 8,000
Total number of board members | director   3  
Right to appoint number of board member | director   1  
Results related to associates   € (8,000)