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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories

    US dollars  
    June 30, 2018     December 31, 2017  
    (unaudited)        
             
Raw materials     13,963       12,734  
Work in process     1,562,223       1,556,256  
Finished products     67,862       144,493  
      1,644,048       1,713,483  
Less – provision for slow moving inventory     (756,134 )     (756,134 )
      887,914       957,349