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Note 15 - Other Long-term Liabilities - Provision Presentation According to ASC 715 (Details) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Retirement Indemnity Plans, France [Member]      
Non-current liabilities € 966 € 867  
Current liabilities 10 27  
Accumulated other comprehensive income (loss) (161) (165)  
Total 815 729 € 672
Defined Benefit Retirement Indemnity Plans, Japan [Member]      
Non-current liabilities 1,255 1,141  
Current liabilities 55 40  
Accumulated other comprehensive income (loss) (416) (412)  
Total € 895 € 769 € 698