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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Annual Rates of Depreciation

Annual rates of depreciation are as follows:

 

     %

Machinery and equipment

   10-33
   (mainly 20)

Leasehold improvements

   Over the term of the
lease (mainly 10)

Buildings

   3

Office furniture and equipment

   6-33

Computer equipment

   20-33

Vehicles

   15-25