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Fixed assets (Narrative) (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Fixed Assets € 114,389 € 87,220
Useful lives 20-40 years  
Capitalized borrowing costs € 1,140  
Italy [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Fixed Assets 44,986
Useful lives 20 years  
Spain [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Fixed Assets € 109,545 € 24,753
Useful lives 25 years  
Italy and Spain [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation expenses € 4,383  
Netherlands [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Depreciation expenses € 1,353  
Useful lives 12 years  
Photovoltaic Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Fixed Assets € 102,784  
Biogas Installations [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Fixed Assets € 19,588