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Severance Pay (Tables)
12 Months Ended
Dec. 31, 2022
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 2   2 0 2 1 
   U.S. dollars in thousands 
         
Accrued severance pay  $1,930   $2,361 
Severance pay fund   (1,914)   (2,325)
Unfunded balance  $16   $36