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Fixed assets (Schedule of Fixed Assets) (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Balance € 87,220  
Balance 114,389 € 87,220
Photovoltaic Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 102,784  
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 117,135 103,252
Additions 74,343 13,883
Disposals (68,908)  
Effect of changes in exchange rates 1  
Balance 122,571 117,135
Gross carrying amount [member] | Photovoltaic Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 98,289 87,922
Additions [1] 73,402 10,367
Disposals [1] (68,908)  
Effect of changes in exchange rates 1  
Balance 102,784 98,289
Gross carrying amount [member] | Biogas installation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 18,656 15,157
Additions 932 3,499
Disposals  
Effect of changes in exchange rates  
Balance 19,588 18,656
Gross carrying amount [member] | Office furniture and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 138 121
Additions 9 17
Disposals  
Effect of changes in exchange rates  
Balance 147 138
Gross carrying amount [member] | Leasehold Improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 52 52
Additions
Disposals  
Effect of changes in exchange rates  
Balance 52 52
Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 29,915 24,415
Depreciation for the year 5,744 5,500
Disposals (27,477)  
Balance 8,182 29,915
Depreciation [Member] | Photovoltaic Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 28,550 24,154
Depreciation for the year 4,383 4,396
Disposals [1] (27,477)  
Balance 5,456 28,550
Depreciation [Member] | Biogas installation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 1,192 111
Depreciation for the year 1,353 1,081
Disposals  
Balance 2,545 1,192
Depreciation [Member] | Office furniture and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 121 98
Depreciation for the year 8 23
Disposals  
Balance 129 121
Depreciation [Member] | Leasehold Improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 52 52
Depreciation for the year
Disposals  
Balance 52 52
Carrying Amounts [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 87,220 78,837
Balance 114,389 87,220
Carrying Amounts [Member] | Photovoltaic Plants [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 69,739 63,768
Balance 97,328 69,739
Carrying Amounts [Member] | Biogas installation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 17,464 15,046
Balance 17,043 17,464
Carrying Amounts [Member] | Office furniture and equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance 17 23
Balance 18 17
Carrying Amounts [Member] | Leasehold Improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance
Balance
[1] See Note 6C