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COSTS OF SALES - Schedule of Costs of Sales (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
COSTS OF SALES      
Direct costs of sales € (14,058) € (14,919) € (13,683)
Indirect costs of sales (9,225) (8,990) (8,583)
Total cost of sales € (23,283) € (23,909) € (22,266)