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Employees' Rights Upon Retirement (Tables)
12 Months Ended
Dec. 31, 2017
Employees' Rights Upon Retirement [Abstract]  
Summary of amounts accrued and the portions funded, with severance pay funds and by the insurance policies
   December 31, 
   2 0 1 7  2 0 1 6 
   U.S. dollars in thousands 
        
 Accrued severance pay $1,712  $1,687 
 Less - amounts funded (presented in “investment and other non-current assets”)  (1,642)  (1,565)
 Unfunded balance $70  $122