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Supplementary Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2019
Supplementary Balance Sheet Information [Abstract]  
Schedule of cash cash equivalents and deposits
  December 31, 
   2 0 1 9   2 0 1 8 
   U.S. dollars in 
   thousands 
         
Cash  $2,681   $1,389 
Cash eqivalents   3,798    1,350 
Total cash and cash equivalents  $6,479   $2,739 
           
Short-term bank deposits*  $6,795   $8,714 
           
Long-term bank deposit  $-   $98 

 

*The average rate of short-term deposits is 2.42 % and 2.92%, as of December 31, 2019 and 2018, respectively.
Schedule of accounts receivable, other
   December 31, 
   2 0 1 9   2 0 1 8 
   U.S. dollars in 
   thousands 
         
Government institutions  $213   $227 
Employees   47    19 
Interest receivable   70    85 
Sundry   247    229 
   $577   $560 
Schedule of accounts payable and accruals - other
   December 31, 
   2 0 1 9   2 0 1 8 
  U.S. dollars in 
   thousands 
         
Payroll and related expenses  $797   $899
Government institutions   645    218 
Accrued vacation pay   91    79 
Accrued expenses and sundry   515    305 
   $2,048   $1,501