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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories

    US dollars  
    March 31, 2018     December 31, 2017  
    (unaudited)        
             
Raw materials     14,504       12,734  
Work in process     1,590,283       1,556,256  
Finished products     85,586       144,493  
                 
      1,690,373       1,713,483  
Less – provision for slow moving inventory     (756,134 )     (756,134 )
                 
      934,239       957,349