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Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of composition of assets, grouped by major classification

   December 31, 
   2 0 1 9   2 0 1 8 
   U.S. dollars in thousands 
         
Computers and electronic equipment  $1,794   $1,892 
Office furniture and equipment   155    155 
Vehicles   109    122 
Leasehold improvements   22    22 
    2,080    2,191 
Less - accumulated depreciation and amortization   (1,913)   (2,027)
   $167   $164 
Schedule of property and equipment by geographical location

   December 31, 
   2 0 1 9   2 0 1 8 
   U.S. dollars in thousands 
         
Israel  $60   $76 
Romania   94    88 
Germany   13    - 
Total  $167   $164