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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of significant accounting policies [Abstract] |
Schedule of Estimated Useful Lives | The estimated useful lives are as follows:
| % |  | Mainly %
Office furniture and equipment | 6-33 |  | 33
Photovoltaic plants in Spain | 4 |  | 4
Photovoltaic plants in Italy | 5 |  | 5
Anaerobic digestion plants in the Netherlands | 8 |  | 8
Leasehold improvements | Over the shorter of the lease period or the life of the asset |  | 7

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