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TOTAL SALES - Sales by Geographical Area (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues € 41,649 € 44,859 € 39,163
Asia [Member]      
Revenues 15,872 17,939 14,119
France      
Revenues 10,021 11,350 11,577
USA      
Revenues 5,611 5,194 2,048
Other geographical Areas [Member]      
Revenues € 10,146 € 10,377 € 11,419