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Property and Equipment, Net (Tables)
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of composition of assets, grouped by major classification
   December 31, 
   2 0 2 0   2 0 1 9 
   U.S. dollars in thousands 
         
Computers and electronic equipment  $1,902   $1,794 
Office furniture and equipment   157    155 
Vehicles   109    109 
Leasehold improvements   27    22 
    2,195    2,080 
Less - accumulated depreciation and amortization   (2,036)   (1,913)
           
   $159   $167 
Schedule of property and equipment by geographical location
   December 31, 
   2 0 2 0   2 0 1 9 
   U.S. dollars in thousands 
         
Israel  $63   $60 
Romania   83    94 
Germany   13    13 
           
Total  $159   $167