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Related party transactions - President, CEO (Details) - Rajeev Suri - EUR (€)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related party transactions      
Base salary / fee € 1,300,000 € 1,050,000 € 1,050,000
Cash incentive payments 637,163 873,862 997,369
Share-based payment expenses 2,265,547 1,978,268 2,606,613
Pension expenses 353,846 312,607 338,787
Total € 4,556,556 € 4,214,737 € 4,992,769