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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of the status of the 2011 share incentive plan

   Years ended December 31, 
   2 0 1 9   2 0 1 8   2 0 1 7 
   Number   Weighted
average
exercise
price		   Number   Weighted
average
exercise
price		   Number   Weighted
average
exercise
price		 
                         
Options outstanding at the beginning of year   674,200   $1.460    813,100   $1.490   875,500   $1.600 
Changes during year:                              
Granted (a)   156,000   $0.003    118,000   $0.003   90,000   $0.650 
Exercised   (108,200)  $0.003    (131,800)  $0.003    (46,000)  $1.150 
Forfeited   (90,000)  $0.003    (74,100)  $0.500   (78,400)  $1.410 
Expired   (280,000)  $2.947    (51,000)  $2.950   (28,000)  $2.950 
Options outstanding at the end of year   352,000   $0.23    674,200   $1.46    813,100   $1.490 
                               
Options exercisable at the end of year   34,000   $1.49    350,000   $2.630    303,000   $2.900 
                               
Weighted average grant date fair value of options granted during the year (b)       $1.31        $1.46       $1.30 

 

(a)In the years ended December 31, 2019 and 2018, the options were granted with an exercise price equal to par value of NIS 0.01.

 

In the year ended December 31, 2017, the options were granted with an exercise price equal to the average closing price per share of the Company's ordinary shares on the stock market during the 30-day trading period immediately preceding the date of grant of such option, or 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 1 9   2 0 1 8   2 0 1 7 
             
Dividend yield   11%   11%   11%
Expected volatility*   25%   28%   35%
Average risk-free interest rate   1.86%   2.6%   1.9%
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 1 9   life   price   2 0 1 9   life   price 
        Years           Years     
                          
$0.003    320,000    3.65   $0.003    14,000    2   $0.003 
$2.425 – 2.688    32,000    1.9   $2.49    20,000    1.64   $2.53