Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Stockholders' Equity Note [Abstract]

Schedule of status of the 2011 share incentive plan

	Years Ended December 31,
	2 0 2 1					2 0 2 0					2 0 1 9
	Number			Weighted average exercise price		Number			Weighted average exercise price		Number			Weighted average exercise price
Options outstanding at the beginning of year		266,500		$	0.003		352,000		$	0.23		674,200		$	1.460
Changes during year:
Granted (a)		172,000		$	0.003		64,000		$	0.003		156,000		$	0.003
Exercised		(71,500	)	$	0.003		(89,500	)	$	0.003		(108,200	)	$	0.003
Forfeited		(96,500	)	$	0.003		(56,000	)	$	1.233		(90,000	)	$	0.003
Expired		(1,000	)	$	0.003		(4,000	)	$	2.688		(280,000	)	$	2.947
Options outstanding at the end of year		269,500		$	0.003		266,500		$	0.003		352,000		$	0.23
Options exercisable at the end of year		30,000		$	0.003		23,000		$	0.003		34,000		$	1.49
Weighted average grant date fair value of options granted during the year (b)				$	1.79				$	1.32				$	1.31

(a) In the years ended December 31, 2021 and 2020 and 2019, 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 1			2 0 2 0			2 0 1 9
Dividend yield		8.73	%		10.3	%		11	%
Expected volatility*		34	%		22	%		25	%
Average risk-free interest rate		0.81	%		0.53	%		1.86	%
Expected average term - in years		3.88			3.88			3.88

Schedule of information about options outstanding and exercisable

		Options Outstanding						Options Exercisable
Range of exercise prices		Number outstanding at December 31, 2021		Weighted average remaining contractual life		Weighted average exercise price		Number exercisable at December 31, 2021		Weighted average remaining contractual life		Weighted average exercise price
				Years						Years
$	0.003		269,500		3.41	$	0.003		30,000		2.04	$	0.003