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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment, Net

    US dollars  
    December 31,  
    2018     2017  
Computers     315,486       324,690  
Furniture and office equipment     233,439       263,106  
Leasehold improvements     45,842       49,558  
      594,767       637,354  
Less – accumulated depreciation     (444,988 )     (420,608 )
      149,779       216,746