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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2016
Property and Equipment [Abstract]  
Schedule of composition of assets, grouped by major classification
   December 31, 
   2 0 1 6  2 0 1 5 
   U.S. dollars in thousands 
        
 Computers and electronic equipment $1,807  $1,756 
 Land  263   263 
 Office furniture and equipment  152   166 
 Vehicles  146   201 
 Leasehold improvements  8   8 
    2,376   2,394 
 Less - accumulated depreciation and amortization  1,878   1,803 
   $498  $591