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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2023
Shareholders' Equity [Abstract]  
Schedule of Compensation Costs Charged Against Income for the 2011 Share Incentive Plan The compensation costs charged against income for the 2011 Share Incentive Plan were comprised as follows:
   Years Ended December 31, 
   2 0 2 3   2 0 2 2   2 0 2 1 
   U.S. dollars in thousands 
             
Cost of revenues  $60   $63   $49 
Research and development expenses   180    159    90 
Selling and marketing expenses   3    1    4 
General and administrative expenses   38    35    28 
   $281   $258   $171 
Schedule of Status of the 2011 Share Incentive Plan The following is a summary of the status of the 2011 Share Incentive Plan as of December 31, 2023, 2022 and 2021, and changes during the years ended on those dates:
   Years Ended December 31, 
   2 0 2 3   2 0 2 2   2 0 2 1 
   Number   Weighted average exercise
price		   Number   Weighted average exercise
price		   Number   Weighted average exercise
price		 
                         
Options outstanding at the beginning of year   452,500   $0.003    269,500   $0.003    266,500   $0.003 
Changes during year:                              
Granted (a)   132,000   $0.003    304,000   $0.003    172,000   $0.003 
Exercised   (60,500)  $0.003    (67,000)  $0.003    (71,500)  $0.003 
Forfeited   (15,000)  $0.003    (54,000)  $0.003    (96,500)  $0.003 
Expired   (8,000)  $0.003    -   $0.003    (1,000)  $0.003 
Options outstanding at the end of year   501,000   $0.003    452,500   $0.003    269,500   $0.003 
                               
Options exercisable at the end of year   30,000   $0.003    25,500   $0.003    30,000   $0.003 
                               
Weighted average grant date fair value of options granted during the year (b)       $1.28        $1.58        $1.79 
(a)In the years ended December 31, 2023 and 2022 and 2021, the options were granted with an exercise price equal to par value of NIS 0.01 ($0.003).
(b)The fair value of each stock option granted is computed on the date of grant according to the Black-Scholes option pricing model with the following assumptions:
Schedule of Stock Option Granted is Computed on the Date of Grant According to the Black-Scholes Option Pricing Model The fair value of each stock option granted is computed on the date of grant according to the Black-Scholes option pricing model with the following assumptions:
   Years Ended December 31, 
   2 0 2 3   2 0 2 2   2 0 2 1 
             
Dividend yield   10.48%   9.69%   8.73%
Expected volatility*   51%   30%   34%
Average risk-free interest rate   4.53%   1.99%   0.81%
Expected average term - in years   3.88    3.88    3.88 
*Volatility is based on the historical volatility of the Company’s share price for periods matching the expected term of the option until exercise.
Schedule of Information about Options Outstanding and Exercisable The following table summarizes information about options outstanding and exercisable as of December 31, 2023:
    Options Outstanding   Options Exercisable 
    Number   Weighted       Number   Weighted     
    outstanding   average   Weighted   exercisable   average   Weighted 
Range of   at   remaining   average   at   remaining   average 
exercise   December 31,   contractual   exercise   December 31,   contractual   exercise 
prices   2 0 2 3   life   price   2 0 2 3   life   price 
        Years           Years     
                                 
$0.003    501,000    3.27   $0.003    30,000    1.45   $0.003