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Supplementary Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure Text Block Supplement [Abstract]  
Schedule of cash cash equivalents and deposits
   December 31, 
   2 0 2 0   2 0 1 9 
   U.S. dollars in thousands 
         
Cash  $4,221   $2,681 
Cash equivalents   4,039    3,798 
Total cash and cash equivalents  $8,260   $6,479 
           
Short-term bank deposits*  $7,180   $6,795 
*The average rate of short-term deposits is 1.27% and 2.42%, as of December 31, 2020 and 2019, respectively.
Schedule of accounts receivable, other
   2 0 2 0   2 0 1 9 
   U.S. dollars in thousands 
         
Government institutions  $29   $213 
Employees   26    47 
Interest receivable   23    70 
Sundry   191    247 
   $269   $577 
Schedule of accounts payable and accruals - other
   December 31, 
   2 0 2 0   2 0 1 9 
   U.S. dollars in thousands 
         
Payroll and related expenses  $801   $797 
Government institutions   370    415 
Accrued vacation pay   101    91 
Accrued expenses and sundry   636    515 
   $1,908   $1,818