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OTHER REVENUES - Other Revenues (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other revenues:      
Revenues € 41,649 € 44,859 € 39,163
Other revenues      
Other revenues:      
Revenues 12 52 19
Licenses and others      
Other revenues:      
Revenues € 12 € 52 € 19