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TOTAL SALES - Timing of Revenue Recognition (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues € 41,649 € 44,859 € 39,163
Products transferred at a point in time      
Revenues 32,862 36,767 31,373
Products and services transferred over time      
Revenues € 8,787 € 8,092 € 7,790