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Investee Companies and other investments (Subsidiaries Business Combinations) (Narrative) (Details)
€ in Thousands, ₪ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2017
ILS (₪)
Jul. 31, 2016
EUR (€)
Jul. 31, 2015
EUR (€)
Dec. 31, 2017
EUR (€)
$ / shares
Dec. 31, 2017
ILS (₪)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
[1]
Oct. 18, 2017
ILS (₪)
Oct. 18, 2017
EUR (€)
Jun. 30, 2017
EUR (€)
Apr. 30, 2017
EUR (€)
Dec. 31, 2010
Disclosure of subsidiaries [line items]                          
Amount of loan       € 44,864   € 44,864 € 17,737            
Fair value of identifiable assets acquired and liabilities assumed                   € 9,851      
Revenue           € 13,636 € 11,632 [1] € 12,446          
Weighted interest rate       3.50%   3.50% 3.50%           3.43%
Israel Electricity Authority [Member]                          
Disclosure of subsidiaries [line items]                          
Period of concession project         16 years 16 years              
Weighted interest rate       5.90%   5.90%              
Bottom of range [Member]                          
Disclosure of subsidiaries [line items]                          
Weighted interest rate       1.60%   1.60% 1.60%            
Top of range [member]                          
Disclosure of subsidiaries [line items]                          
Weighted interest rate       3.50%   3.50% 3.50%            
Euro [Member] | Groen Gas Oude-Tonge Anaerobic Digestion Project [Member]                          
Disclosure of subsidiaries [line items]                          
Amount of loan       € 475   € 475         € 1,700    
Percentage of Acquired additional interest subsidiaries 51.00%                        
Ellomay Spain S.L [Member]                          
Disclosure of subsidiaries [line items]                          
Percentage of Acquired additional interest subsidiaries     15.00%                    
Ellomay Spain S.L [Member] | Bottom of range [Member]                          
Disclosure of subsidiaries [line items]                          
Percentage of Acquired additional interest subsidiaries     85.00%                    
Ellomay Spain S.L [Member] | Top of range [member]                          
Disclosure of subsidiaries [line items]                          
Percentage of Acquired additional interest subsidiaries     100.00%                    
Ellomay Spain S.L [Member] | Euro [Member]                          
Disclosure of subsidiaries [line items]                          
Acquired additional interest of susidiaries     € 775                    
Ellomay Luxembourg [Member] | Waste-to-energy [Member]                          
Disclosure of subsidiaries [line items]                          
Percentage of Acquired additional interest subsidiaries   51.00%                      
Ellomay Luxembourg [Member] | Groen Goor Anaerobic Digestion Project [Member]                          
Disclosure of subsidiaries [line items]                          
Percentage of Acquired additional interest subsidiaries   51.00%                      
Ludan [Member] | Waste-to-energy [Member]                          
Disclosure of subsidiaries [line items]                          
Percentage of Acquired additional interest subsidiaries   49.00%                      
Ludan [Member] | Groen Goor Anaerobic Digestion Project [Member]                          
Disclosure of subsidiaries [line items]                          
Percentage of Acquired additional interest subsidiaries         51.00% 51.00%              
Ludan [Member] | Euro [Member] | Groen Goor Anaerobic Digestion Project [Member]                          
Disclosure of subsidiaries [line items]                          
Amount of loan   € 2,000                      
Talasol [Member]                          
Disclosure of subsidiaries [line items]                          
Aggregate purchase price                       € 10,000  
Talmei Yosef [Member]                          
Disclosure of subsidiaries [line items]                          
Percentage of Acquired additional interest subsidiaries 100.00%                        
Aggregate purchase price                   € 11,815 € 9,476    
Percentage of financed amount 100.00%                        
Period of plant operate         20 years 20 years              
Electricity produced per KWP | $ / shares       € 0.9631                  
Talmei Yosef [Member] | Operation of PV Plant [Member]                          
Disclosure of subsidiaries [line items]                          
Revenue           € 183              
Talmei Yosef [Member] | NIS [Member]                          
Disclosure of subsidiaries [line items]                          
Aggregate purchase price | ₪ ₪ 39,000               ₪ 48,625        
Talmei Yosef [Member] | NIS [Member] | Operation of PV Plant [Member]                          
Disclosure of subsidiaries [line items]                          
Revenue | ₪         ₪ 757                
[1] Please refer to note 2C for functional and presentation currency.