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Supplementary Balance Sheet Information (Tables)
 12 Months Ended
Dec. 31, 2024
Supplementary Balance Sheet Information [Abstract]  
Schedule of Cash and Short Term Bank Deposits Cash, cash equivalents and short-term bank deposits:
   December 31, 
   2 0 2 4   2 0 2 3 
   U.S. dollars in 
   thousands 
         
Cash  $2,960   $2,187 
Cash equivalents   1,492    771 
Total cash and cash equivalents  $4,452   $2,958 
           
Short-term bank deposits*  $11,108   $13,464 

 

*The average interest rate on short-term deposits is 5.09% and 6.05%, as of December 31, 2024 and 2023, respectively.
Schedule of Other Current Assets Other current assets:
   December 31, 
   2 0 2 4   2 0 2 3 
   U.S. dollars in 
   thousands 
         
Government institutions  $135   $114 
Employees   10    9 
Interest receivable   258    344 
Sundry   90    71 
   $493   $538 
Schedule of Other Current Liabilities and Accruals Other current liabilities and accruals:
   December 31, 
   2 0 2 4   2 0 2 3 
   U.S. dollars in 
   thousands 
         
Payroll and related expenses  $801   $814 
Government institutions   194    135 
Accrued vacation pay   77    68 
Accrued expenses and sundry   397    732 
   $1,469   $1,749