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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Fair Value Measurement Inputs Level 1 (Details) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets:        
Cash and cash equivalents € 24,696 € 20,886 € 19,464 € 20,004
Liabilities:        
Short-term borrowings 2,638 3,513    
Long-Term Debt 5,675 1,420    
Fair Value, Inputs, Level 1 [Member]        
Assets:        
Cash and cash equivalents 24,696 20,886    
Liabilities:        
Short-term borrowings 2,638 3,513    
Long-Term Debt € 5,675 € 1,420