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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Shareholders' Equity [Abstract] |
Summary of the status of the 2011 share incentive plan |
|  |  | Years ended December 31, |
|  |  | 2 0 1 6 |  |  | 2 0 1 5 |  |  | 2 0 1 4 |
|  |  | Number |  |  | Weighted average exercise price |  |  | Number |  |  | Weighted average exercise price |  |  | Number |  |  | Weighted average exercise price |
| Options outstanding at beginning of year |  |  | 710,300 |  |  | $ | 2.51 |  |  |  | 851,600 |  |  | $ | 2.63 |  |  |  | 460,000 |  |  | $ | 1.93 |
| Changes during year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Granted (a) |  |  | 344,000 |  |  | $ | 0.003 |  |  |  | 116,800 |  |  | $ | 1.66 |  |  |  | 666,000 |  |  | $ | 2.81 |
| Exercised |  |  | (59,000 | ) |  | $ | 1.45 |  |  |  | (92,100 | ) |  | $ | 1.85 |  |  |  | (225,400 | ) |  | $ | 1.88 |
| Forfeited |  |  | (117,800 | ) |  | $ | 2.49 |  |  |  | (166,000 | ) |  | $ | 2.88 |  |  |  | (49,000 | ) |  | $ | 2.03 |
| Expired |  |  | (2,000 | ) |  | $ | 2.16 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
| Options outstanding at end of year |  |  | 875,500 |  |  | $ | 1.60 |  |  |  | 710,300 |  |  | $ | 2.51 |  |  |  | 851,600 |  |  | $ | 2.63 |
| Options exercisable at end of year |  |  | 246,500 |  |  | $ | 2.87 |  |  |  | 51,000 |  |  | $ | 1.98 |  |  |  | 43,600 |  |  | $ | 2.00 |
| Vested and expected to vest at end of year |  |  | 771,084 |  |  | $ | 1.81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Weighted average grant date fair value of options granted during the year (b) |  |  |  |  |  | $ | 1.46 |  |  |  |  |  |  | $ | 0.94 |  |  |  |  |  |  | $ | 0.51 |
Summary of fair value of each 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 6 |  |  | 2 0 1 5 |  |  | 2 0 1 4 |
| Dividend yield |  |  | 11 | % |  |  | 10 | % |  |  | 11 | %
| Expected volatility* |  |  | 35 | % |  |  | 48 | % |  |  | 44 | %
| Average risk-free interest rate |  |  | 2.0 | % |  |  | 1.5 | % |  |  | 1.5 | %
| 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.
Summarizes 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 6 |  |  | life |  |  | price |  |  | 2 0 1 6 |  |  | life |  |  | price |
|  |  |  |  |  | Years |  |  |  |  |  |  |  |  | Years |  |  |  |
| $ 0.003 – 2.160 |  |  | 423,000 |  |  |  | 4.33 |  |  | $ | 0.18 |  |  |  | 19,000 |  |  |  | 1.18 |  |  | $ | 2.16 |
| $ 2.410 – 2.947 |  |  | 452,500 |  |  |  | 2.81 |  |  | $ | 2.93 |  |  |  | 227,500 |  |  |  | 2.75 |  |  | $ | 2.93 |
|  |  |  | 875,500 |  |  |  | 3.54 |  |  | $ | 1.60 |  |  |  | 246,500 |  |  |  | 2.63 |  |  | $ | 2.87 |

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