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Reportable Segments (Tables)
 12 Months Ended
Dec. 31, 2020
Segment Reconciliation [Abstract]  
Schedule of segments commencing from the date of acquisitions
   Year Ended December 31, 2020 
   Billing and
Related
Services		   Messaging   Total 
    U.S. dollars in thousands 
             
Revenues  $14,628   $8,746   $23,374 
                
Operating income  $4,412   $1,051   $5,463 
   Year Ended December 31, 2019 
   Billing and
Related
Services		   Messaging*   Total 
    U.S. dollars in thousands 
             
Revenues  $16,547   $6,117   $22,664 
                
Operating income  $4,254   $786   $5,040 
*The results of operations reported for the year ended December 31, 2019, includes the results of operations of Messaging commencing the second quarter of 2019 (see Note 1a(3)).