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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Class Of Stock [Line Items] |
Schedule of Assumptions for Fair Value of Option Grant | In connection with the stock option grants during 2021 and 2020, 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:
|  | 2021 |  | 2020
Risk-free interest rate |  | 0% - 1% |  | 0% - 2%
Expected life (years) |  | 6.6 |  | 6.8
Expected volatility |  | 80% |  | 74%
Expected dividend yield |  | Zero |  | Zero
Schedule of Changes in Common Stock Options | The following summarizes the changes in common stock options for 2021 and 2020:
|  | 2021 |  |  | 2020 |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 3,516,225 |  |  | $ | 0.63 |  |  |  | 3,611,850 |  |  | $ | 0.51 |
Granted |  |  | 722,500 |  |  | $ | 2.28 |  |  |  | 474,750 |  |  | $ | 1.62 |
Exercised |  |  | (1,895,437 | ) |  | $ | 0.48 |  |  |  | (383,350 | ) |  | $ | 0.46 |
Expired |  |  | — |  |  | $ | — |  |  |  | (20,000 | ) |  | $ | 0.83 |
Forfeited |  |  | (150,000 | ) |  | $ | 1.61 |  |  |  | (167,025 | ) |  | $ | 1.15 |
Outstanding at end of year |  |  | 2,193,288 |  |  | $ | 1.23 |  |  |  | 3,516,225 |  |  | $ | 0.63 |
Options exercisable at year end |  |  | 978,350 |  |  | $ | 0.60 |  |  |  | 2,566,100 |  |  | $ | 0.47 |
Weighted-average fair value of options granted during the year |  |  |  |  | $ | 1.59 |  |  |  |  |  | $ | 1.64 |
Schedule of Information about All Stock Options Outstanding | The following table summarizes information about all stock options outstanding at December 31, 2021:
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 $ 0.48 |  |  | 742,225 |  |  |  | 5.0 |  |  | $ | 0.44 |  |  |  | 700,600 |  |  |  | 4.9 |  |  | $ | 0.44 |
$ 0.53 to $ 0.95 |  |  | 501,063 |  |  |  | 7.7 |  |  | $ | 0.76 |  |  |  | 212,750 |  |  |  | 7.6 |  |  | $ | 0.76 |
$ 1.41 to $ 1.90 |  |  | 612,500 |  |  |  | 9.3 |  |  | $ | 1.47 |  |  |  | 47,500 |  |  |  | 8.5 |  |  | $ | 1.47 |
$ 2.77 to $ 3.33 |  |  | 337,500 |  |  |  | 9.2 |  |  | $ | 2.77 |  |  |  | 17,500 |  |  |  | 8.6 |  |  | $ | 2.77 |
|  |  | 2,193,288 |  |  |  |  |  |  |  |  |  | 978,350 |  |  |  |  |  |  |
Other Options Issued [Member] |
Class Of Stock [Line Items] |
Schedule of Stock Options and Other Stock Options Issued |
Other Options |  | 2021 |  |  | 2020 |
Options outstanding, beginning of year |  |  | 344,375 |  |  |  | 265,000 |
Options issued |  |  | 150,000 |  |  |  | 90,000 |
Options exercised |  |  | (22,500 | ) |  |  | (10,625 | )
Options forfeited |  |  | (67,500 | ) |  |  | — |
Options outstanding, end of year |  |  | 404,375 |  |  |  | 344,375 |
2003 Stock Option and Appreciation Rights Plan [Member] |
Class Of Stock [Line Items] |
Schedule of Stock Options and Other Stock Options Issued |
2003 Plan |  | 2021 |  |  | 2020 |
Options outstanding, beginning of year |  |  | — |  |  |  | 20,000 |
Options expired |  |  | — |  |  |  | (20,000 | )
Options outstanding, end of year |  |  | — |  |  |  | — |
2010 Non-Qualified Stock Option Plan [Member] |
Class Of Stock [Line Items] |
Schedule of Stock Options and Other Stock Options Issued |
2010 Plan |  | 2021 |  |  | 2020 |
Options outstanding, beginning of year |  |  | 1,100,000 |  |  |  | 975,000 |
Options granted |  |  | 50,000 |  |  |  | 125,000 |
Options exercised |  |  | (793,750 | ) |  |  | — |
Options forfeited |  |  | (25,000 | ) |  |  | — |
Options outstanding, end of year |  |  | 331,250 |  |  |  | 1,100,000 |
2016 Stock Option Plan [Member] |
Class Of Stock [Line Items] |
Schedule of Stock Options and Other Stock Options Issued |
2016 Plan |  | 2021 |  |  | 2020 |
Options outstanding, beginning of year |  |  | 2,071,850 |  |  |  | 2,351,850 |
Options granted |  |  | 522,500 |  |  |  | 259,750 |
Options exercised |  |  | (1,079,187 | ) |  |  | (372,725 | )
Options forfeited |  |  | (57,500 | ) |  |  | (167,025 | )
Options outstanding, end of year |  |  | 1,457,663 |  |  |  | 2,071,850 |

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