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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets [Abstract]  
Schedule of definite-lived intangible assets
   December 31, 
   2 0 2 2   2 0 2 1 
   U.S. dollars in thousands 
         
Core technology  $312   $312 
Customer relationships   545    545 
    857    857 
Less – accumulated amortization   (524)   (348)
    333    509 
Functional currency translation adjustments   41    13 
Total intangible assets, net  $374   $522 

 
Schedule of goodwill
   Billing and
related services		    Messaging   Total 
   U.S. dollars in thousands 
             
Balance as of January 1, 2021  $5,430   $2,709   $8,139 
Changes during the year ended December 31, 2021:               
Functional currency translation adjustments   
-
    (210)   (210)
Balance as of December 31, 2021  $5,430   $2,499   $7,929 
Changes during the year ended December 31, 2022:               
Functional currency translation adjustments   
-
    (144)   (144)
Balance as of December 31, 2022  $5,430   $2,355   $7,785