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

Significant Accounting Policies (Schedule of Estimated Useful Lives) (Details)

v3.19.1
Significant Accounting Policies (Schedule of Estimated Useful Lives) (Details)
12 Months Ended
Dec. 31, 2018
Italian Subsidiaries [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life (Years) 20
Spanish subsidiaries [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life (Years) 25
Office furniture and equipment [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation percentage on straight-line basis over the useful life of the assets (in %) 6-33
Mainly % 33
Photovoltaic plants in Spain [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation percentage on straight-line basis over the useful life of the assets (in %) 4
Mainly % 4
Photovoltaic plants in Italy [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation percentage on straight-line basis over the useful life of the assets (in %) 5
Mainly % 5
Anaerobic digestion plants in the Netherlands [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation percentage on straight-line basis over the useful life of the assets (in %) 8
Mainly % 8
Leasehold Improvements [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Depreciation percentage on straight-line basis over the useful life of the assets (in %) Over the shorter of the lease period or the life of the asset
Mainly % 7
Anaerobic digestion plants [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life (Years) 12