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Other Current Liabilities (Tables)
9 Months Ended
Sep. 30, 2018
Other Liabilities Disclosure [Abstract]  
Schedule of Other Current Liabilities

    US dollars  
    September 30, 2018     December 31, 2017  
    (unaudited)        
             
Employees and related institutions     239,415       336,783  
Accrued expenses     1,383,252       929,171  
      1,622,667       1,265,954