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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure Text Block Supplement [Abstract]  
Schedule of definite-lived other intangible assets
   December 31, 
   2 0 2 0    2 0 1 9 
   U.S. dollars in thousands 
         
Core technology  $312   $312 
Customer relationships   545    545 
    857    857 
Less – accumulated amortization   (217)   (96)
    640    761 
Functional currency translation adjustments   62    - 
Other intangible assets, net  $702   $761 
Schedule of goodwill
   Billing and related services   Messaging   Total 
   U.S. dollars in thousands 
             
Balance as of January 1, 2019  $5,430   $-   $5,430 
Changes during the year ended December 31, 2019:               
Acquisitions   -    2,466    2,466 
Functional currency translation adjustments   -    14    14 
Balance as of December 31, 2019  $5,430   $2,480   $7,910 
Changes during the year ended December 31, 2020:               
Functional currency translation adjustments   -    229    229 
Balance as of December 31, 2020  $5,430   $2,709   $8,139