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Note 18 - Total Sales - Sales by Geographical Area (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues € 44,859 € 39,163 € 35,686
Asia [Member]      
Revenues 17,939 14,119 13,461
FRANCE      
Revenues 11,350 11,577 10,573
UNITED STATES      
Revenues 5,194 2,048 1,748
Other geographical Areas [Member]      
Revenues € 10,377 € 11,419 € 9,904