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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Stockholders' Equity Note [Abstract]  
Schedule of the status of the 2011 share incentive plan
   Years Ended December 31, 
   2 0 2 0   2 0 1 9   2 0 1 8 
   Number   Weighted
average
exercise
price		   Number   Weighted
average
exercise
price		   Number   Weighted
average
exercise
price		 
                         
Options outstanding at the beginning of year   352,000   $0.23    674,200   $1.460    813,100   $1.490 
Changes during year:                              
Granted (a)   64,000   $0.003    156,000   $0.003    118,000   $0.003 
Exercised   (89,500)  $0.003    (108,200)  $0.003    (131,800)   $0.0 03 
Forfeited   (56,000)  $1.233    (90,000)  $0.003    (74,100)  $0.500 
Expired   (4,000)  $2.688    (280,000)  $2.947    (51,000)  $2.950 
Options outstanding at the end of year   266,500   $0.003    352,000   $0.23    674,200   $1.46 
                               
Options exercisable at the end of year   23,000   $0.003    34,000   $1.49    350,000   $2.630 
                               
Weighted average grant date fair value of options granted during the year (b)       $1.32        $1.31        $1.46 
(a)In the years ended December 31, 2020 and 2019 and 2018, the options were granted with an exercise price equal to par value of NIS 0.01.
(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 0   2 0 1 9   2 0 1 8 
             
Dividend yield   10.3%   11%   11%
Expected volatility*   22%   25%   28%
Average risk-free interest rate   0.53%   1.86%   2.60%
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   2 0 2 0   life   price   2 0 2 0   life   price 
        Years           Years     
                                 
$0.003    266,500    3.43   $0.003    23,000    1.9   $0.003