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Supplementary Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2023
Selected Statement of Operations Data [Abstract]  
Schedule of Cash and Short Term Bank Deposits Cash, cash equivalents and short-term bank deposits:
   December 31, 
   2 0 2 3   2 0 2 2 
   U.S. dollars in thousands 
         
Cash  $2,187   $4,535 
Cash equivalents   771    730 
Total cash and cash equivalents  $2,958   $5,265 
           
Short-term bank deposits*  $13,464   $12,040 
*The average interest rate on short-term deposits is 6.05% and 4.15%, as of December 31, 2023 and 2022, respectively.
Schedule of Other Current Assets Other current assets:
   December 31, 
   2 0 2 3   2 0 2 2 
   U.S. dollars in thousands 
         
Government institutions  $114   $36 
Employees   9    31 
Interest receivable   344    185 
Sundry   71    41 
   $538   $293 
Schedule of Other Current Liabilities and Accruals Other current liabilities and accruals:
   December 31, 
   2 0 2 3   2 0 2 2 
   U.S. dollars in thousands 
         
Payroll and related expenses  $814   $840 
Government institutions   135    277 
Accrued vacation pay   68    64 
Accrued expenses and sundry   732    797 
   $1,749   $1,978