Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Investee Companies and other investments (Summary of Information on Operating Results) (Details)

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Investee Companies and other investments (Summary of Information on Operating Results) (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
[1]
Disclosure of associates [line items]      
Income for the year € 13,636 € 11,632 [1] € 12,446
Elimination of interest on loan from related party 1,158 1,244  
Company's share of income of investee € 1,531 € 1,375 [1] € 2,202
Dori Energy [Member]      
Disclosure of associates [line items]      
Rate of ownership as of December 31, 2017 50.00% 50.00%  
Income for the year € 1,751 € 490  
Company's share 876 245  
Elimination of interest on loan from related party 1,158 1,244  
Other Adjustments (503) (114)  
Company's share of income of investee € 1,531 € 1,375  
[1] Please refer to note 2C for functional and presentation currency.