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Shareholders' Equity (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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