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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2022
Stockholders' Equity Note [Abstract]  
Schedule of compensation costs charged against income for the 2011 share incentive plan
   Years Ended December 31, 
   2 0 2 2   2 0 2 1   2 0 2 0 
   U.S. dollars in thousands 
             
Cost of revenues  $63   $49   $65 
Research and development expenses   159    90    109 
Selling and marketing expenses   1    4    9 
General and administrative expenses   35    28    30 
   $258   $171   $213 

 
Schedule of status of the 2011 share incentive plan
   Years Ended December 31, 
   2 0 2 2   2 0 2 1   2 0 2 0 
   Number   Weighted average exercise price   Number   Weighted average exercise price   Number   Weighted average exercise price 
                         
                         
Options outstanding at the beginning of year   269,500   $0.003    266,500   $0.003    352,000   $0.23 
Changes during year:                              
Granted (a)   304,000   $0.003    172,000   $0.003    64,000   $0.003 
Exercised   (67,000)  $0.003    (71,500)  $0.003    (89,500)  $0.003 
Forfeited   (54,000)  $0.003    (96,500)  $0.003    (56,000)  $1.233 
Expired   
-
   $0.003    (1,000)  $0.003    (4,000)  $2.688 
Options outstanding at the end of year   452,500   $0.003    269,500   $0.003    266,500   $0.003 
Options exercisable at the end of year   25,500   $0.003    30,000   $0.003    23,000   $0.003 
Weighted average grant date fair value of options granted during the year (b)       $1.58        $1.79        $1.32 

 

(a)In the years ended December 31, 2022 and 2021 and 2020, 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
   Years Ended December 31, 
   2 0 2 2   2 0 2 1   2 0 2 0 
             
Dividend yield   9.69%   8.73%   10.3%
Expected volatility*   30%   34%   22%
Average risk-free interest rate   1.99%   0.81%   0.53%
Expected average term - in years   3.88    3.88    3.88 

 

*Volatility is based on 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
    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   2022   life   price   2022   life   price 
        Years           Years     
                          
$0.003    452,500    3.7   $0.003    25,500    1.45   $0.003