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Severance Pay (Tables)
12 Months Ended
Dec. 31, 2021
Severance Pay [Abstract]  
Schedule of amounts accrued and the portions funded, with severance pay funds and by the insurance policies
   December 31, 
   2 0 2 1   2 0 2 0 
   U.S. dollars in thousands 
         
Accrued severance pay  $2,361   $1,865 
Less - amounts funded (presented in “investment and other non-current assets”)   (2,325)   (1,823)
Unfunded balance  $36   $42