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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property and Equipment [Abstract]  
Schedule of composition of assets, grouped by major classification
  December 31, 
  2 0 1 8  2 0 1 7 
  U.S. dollars in thousands 
       
Computers and electronic equipment $1,892  $1,848 
Office furniture and equipment  155   155 
Vehicles  122   146 
Leasehold improvements  22   18 
   2,191   2,167 
Less - accumulated depreciation and amortization  (2,027)  (1,965)
  $164  $202
Schedule of property and equipment by geographical location
  December 31, 
  2 0 1 8  2 0 1 7 
  U.S. dollars in thousands 
       
Israel $76  $85 
Romania  88   116 
United States  -   1 
  $164  $202