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TRADE ACCOUNTS AND NOTES RECEIVABLE, NET (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
TRADE ACCOUNTS AND NOTES RECEIVABLE, NET      
Trade accounts receivable € 11,363 € 11,807  
Notes receivable 667 1,013  
Less: allowance for doubtful accounts (722) (1,490)  
Total 11,307 11,330  
Less current portion (11,307) (11,328)  
Total long-term portion   2  
Bad debt expense:      
Bad debt expense € 87 € 84 € 362