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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Class Of Stock [Line Items] |
Schedule of Assumptions for Fair Value of Option Grant | In connection with the stock option grants during 2019 and 2018, the fair value of each option grant was estimated on the date of the grant using the Black-Scholes option pricing model with the following assumptions:
|  | 2019 |  |  | 2018 |
Risk-free interest rate |  | 2% - 3% |  |  | 2% - 3% |
Expected life (years) |  |  | 6.8 |  |  |  | 3.2 |
Expected volatility |  | 73% |  |  | 83% |
Expected dividend yield |  | Zero |  |  | Zero |
Schedule of Changes in Common Stock Options | The following summarizes the changes in common stock options for 2019 and 2018:
|  | 2019 |  |  | 2018 |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 4,303,900 |  |  | $ | 0.75 |  |  |  | 5,040,450 |  |  | $ | 0.97 |
Granted |  |  | 649,850 |  |  | $ | 0.74 |  |  |  | 526,500 |  |  | $ | 0.43 |
Exercised |  |  | (31,276 | ) |  | $ | 0.45 |  |  |  | (173,130 | ) |  | $ | 0.43 |
Expired |  |  | (765,000 | ) |  | $ | 2.00 |  |  |  | (1,016,870 | ) |  | $ | 1.74 |
Forfeited |  |  | (545,624 | ) |  | $ | 0.61 |  |  |  | (73,050 | ) |  | $ | 0.77 |
Outstanding at end of year |  |  | 3,611,850 |  |  | $ | 0.51 |  |  |  | 4,303,900 |  |  | $ | 0.75 |
Options exercisable at year end |  |  | 2,157,336 |  |  | $ | 0.46 |  |  |  | 2,533,700 |  |  | $ | 0.96 |
Weighted-average fair value of options granted during the year |  |  |  |  |  | $ | 0.50 |  |  |  |  |  |  | $ | 0.17 |
Schedule of Information about All Stock Options Outstanding | The following table summarizes information about all stock options outstanding at December 31, 2019:
Exercise price |  | Options Outstanding |  |  | Weighted Average Remaining Life (years) |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Remaining Life (years) |  |  | Weighted Average Exercise Price |
$ 0.24 to $ 0.40 |  |  | 100,000 |  |  |  | 7.5 |  |  | $ | 0.34 |  |  |  | 45,000 |  |  |  | 6.9 |  |  | $ | 0.29 |
$ 0.42 to $ 0.48 |  |  | 2,792,250 |  |  |  | 7.0 |  |  | $ | 0.45 |  |  |  | 2,022,336 |  |  |  | 6.9 |  |  | $ | 0.45 |
$ 0.48 to $ 1.00 |  |  | 719,600 |  |  |  | 8.5 |  |  | $ | 0.75 |  |  |  | 90,000 |  |  |  | 1.1 |  |  | $ | 0.76 |
|  |  | 3,611,850 |  |  |  | 7.3 |  |  | $ | 0.51 |  |  |  | 2,157,336 |  |  |  | 6.7 |  |  | $ | 0.46 |
Other Options Issued [Member] |
Class Of Stock [Line Items] |
Schedule of Stock Options and Other Stock Options Issued |
Other Options |  | 2019 |  |  | 2018 |
Options outstanding, beginning of year |  |  | 625,000 |  |  |  | 625,000 |
Options issued |  |  | 265,000 |  |  |  | — |
Options expired |  |  | (625,000 | ) |  |  | — |
Options outstanding, end of year |  |  | 265,000 |  |  |  | 625,000 |
2003 Stock Option and Appreciation Rights Plan [Member] |
Class Of Stock [Line Items] |
Schedule of Stock Options and Other Stock Options Issued |
2003 Plan |  | 2019 |  |  | 2018 |
Options outstanding, beginning of year |  |  | 310,000 |  |  |  | 985,000 |
Options expired |  |  | (140,000 | ) |  |  | (660,000 | )
Options forfeited |  |  | (150,000 | ) |  |  | (15,000 | )
Options outstanding, end of year |  |  | 20,000 |  |  |  | 310,000 |
2010 Non-Qualified Stock Option Plan [Member] |
Class Of Stock [Line Items] |
Schedule of Stock Options and Other Stock Options Issued |
2010 Plan |  | 2019 |  |  | 2018 |
Options outstanding, beginning of year |  |  | 915,000 |  |  |  | 830,000 |
Options granted |  |  | 60,000 |  |  |  | 85,000 |
Options outstanding, end of year |  |  | 975,000 |  |  |  | 915,000 |
Equity Partners Stock Option Plan [Member] |
Class Of Stock [Line Items] |
Schedule of Stock Options and Other Stock Options Issued |
Equity Partners Plan |  | 2018 |
Options outstanding, beginning of year |  |  | 230,000 |
Options expired |  |  | (230,000 | )
Options outstanding, end of year |  |  | — |
2016 Stock Option Plan [Member] |
Class Of Stock [Line Items] |
Schedule of Stock Options and Other Stock Options Issued |
2016 Plan |  | 2019 |  |  | 2018 |
Options outstanding, beginning of year |  |  | 2,453,900 |  |  |  | 2,370,450 |
Options granted |  |  | 324,850 |  |  |  | 441,500 |
Options exercised |  |  | (31,276 | ) |  |  | (173,130 | )
Options expired |  |  | — |  |  |  | (126,870 | )
Options forfeited |  |  | (395,624 | ) |  |  | (58,050 | )
Options outstanding, end of year |  |  | 2,351,850 |  |  |  | 2,453,900 |

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