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Note 16 - Other Long-term Liabilities - Provision Presentation According to ASC 715 (Details) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Retirement Indemnity Plans, France [Member]      
Non-current liabilities € 960 € 966  
Current liabilities 10 10  
Accumulated other comprehensive income (loss) (67) (161)  
Total 903 815 € 729
Defined Benefit Retirement Indemnity Plans, Japan [Member]      
Non-current liabilities 1,207 1,255  
Current liabilities 22 55  
Accumulated other comprehensive income (loss) (136) (416)  
Total € 1,093 € 895 € 770