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Leases (Narrative) (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Lease liability € 15,627  
Right-of-use asset 15,401
Talmei Yosef [Member]    
Statement Line Items [Line Items]    
Right-of-use asset € 1,585
PV Plants [Member] | Talmei Yosef [Member]    
Statement Line Items [Line Items]    
Operating lease agreements (Years) 25 years  
Lease Expire dates Nov. 25, 2034  
PV Plants [Member] | Spain from Private Lessors [Member]    
Statement Line Items [Line Items]    
Operating lease agreements (Years) 16 years  
Lease Expire dates Jul. 25, 2035  
Lease liability € 1,177  
Right-of-use asset € 1,160  
PV Plants [Member] | Spain from Municipality of Talavan [Member]    
Statement Line Items [Line Items]    
Operating lease agreements (Years) 42 years  
Lease Expire dates Sep. 08, 2060  
Lease liability € 12,844  
Right-of-use asset 12,656  
Land [Member] | Talmei Yosef [Member]    
Statement Line Items [Line Items]    
Lease liability 1,606  
Right-of-use asset € 1,585