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Employees' Rights upon Retirement (Tables)
12 Months Ended
Dec. 31, 2016
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 6  2 0 1 5 
   U.S. dollars in thousands 
        
 Accrued severance pay $1,687  $1,786 
 Less - amounts funded (presented in “investment and other non-current assets”)  (1,565)  (1,623)
 Unfunded balance $122  $163