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Note 5 - Operating Segment Reporting - Total Assets Operating Segment (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Total Assets Line Items    
Assets € 753,824,000,000 € 698,690,000,000
Spain [Member]    
Total Assets Line Items    
Assets 419,475,000,000 365,380,000,000
United States [Member]    
Total Assets Line Items    
Assets 101,118,000,000 88,529,000,000
Mexico [Member]    
Total Assets Line Items    
Assets 103,671,000,000 109,079,000,000
Turkey [Member]    
Total Assets Line Items    
Assets 63,525,000,000 64,416,000,000
South America [Member]    
Total Assets Line Items    
Assets 57,891,000,000 54,996,000,000
Rest Of Eurasia [Member]    
Total Assets Line Items    
Assets 26,805,000,000 23,257,000,000
Subtotal [Member]    
Total Assets Line Items    
Assets 772,485,000,000 705,656,000,000
Corporate Center and other adjustments [Member]    
Total Assets Line Items    
Assets (18,661,000,000) (6,967,000,000)
Total    
Total Assets Line Items    
Assets € 753,824,000,000 € 698,690,000,000