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Note 6 - Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Note 6 - Stock-Based Compensation | NOTE 6 — Stock-Based Compensation Plan Stock-Based Compensation Program The Company has one share-based compensation plan in effect in the two years presented: the 2004 Equity Incentive Plan (the “2004 Plan”). The 2004 Plan provides for the grant of incentive stock options, non-statutory stock options, restricted stock, stock appreciation rights, and performance awards to employees, directors, and consultants of the Company. Upon ratification of the 2004 Plan by the shareholders in June 2004, shares in the 1995 Plan that had been reserved but not issued, as well as any shares issued that would otherwise return to the 1995 Plan as a result of termination of options or repurchase of shares, were added to the shares reserved for issuance under the 2004 Plan. The Company grants incentive stock options and restricted stock at an exercise price per share equal to the fair market value per share of common stock on the date of grant. The vesting and exercise provisions are determined by the Board of Directors, with a maximum term of ten years. The 2004 Plan expires on April 23, 2024. The 2004 Plan provides for an annual increase in the number of shares authorized under the plan to be added on the first day of each fiscal year equal to the least amount of 400,000 shares, 4% of the outstanding shares on that date, or an amount as determined by the Board of Directors. On January 1, 2020 and 2019, a total of 240,707 and 235,324 additional shares, respectively, became available for grant from the 2004 Plan. Stock-Based Compensation Information The stock-based compensation expense included in the Company’s statements of income for the years ended December 31, 2020 and 2019, consisted of the following:
|  | Years Ended December 31,
Income Statement Classification |  | 2020 |  | 2019
Cost of revenues |  | $ | 86,649 |  |  | $ | 94,803 |
Research and development |  |  | 137,537 |  |  |  | 151,121 |
Sales and marketing |  |  | 121,802 |  |  |  | 121,633 |
General and administrative |  |  | 161,063 |  |  |  | 152,334 |
|  | $ | 507,051 |  |  | $ | 519,891 |
As of December 31, 2020, the remaining unamortized stock-based compensation expense was $935,882 and is expected to be amortized over a weighted average period of 2.61 years. Stock Options – Stock option awards have an exercise price equal to the closing price on the date of grant, expire in ten years from the date of grant and vest over a four-year period at 25% per year. The Company calculates the value of each stock option grant, estimated on the date of grant, using binomial lattice option pricing model. The weighted-average estimated fair value of stock options granted during 2020 and 2019 was $0.50 and $1.08, respectively, using the following weighted-average assumptions:
|  | Years Ended December 31,
|  | 2020 |  | 2019
Risk-free interest rate (%) |  |  | 0.68 | % |  |  | 1.614 | %
Dividend yield |  |  | — |  |  |  | — |
Volatility factor |  |  | 43.62 | % |  |  | 42.58 | %
Expected option life (years) |  |  | 7.4 |  |  |  | 7.2 |
The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant; the dividend yield is calculated as the ratio of dividends paid per share of common stock to the stock price on the date of grant; the expected life is based on historical and expected exercise behavior; and volatility is based on the historical volatility of the Company’s stock price over the expected life of the option. The table below presents the information related to stock option activity for the years ended December 31, 2020 and 2019:
|  | Years Ended December 31,
|  | 2020 |  | 2019
Total intrinsic value of stock options exercised |  | $ | 167,882 |  |  | $ | 16,568 |
Cash received from stock option exercises |  | $ | 168,065 |  |  | $ | 23,314 |
The following summarizes stock option activity under the 2004 Plan as of and for the years ended December 31, 2020 and 2019:
|  |  | Outstanding Options
|  |  | Number of Shares |  |  |  | Weighted Average Price Per Share |  |  |  | Remaining Contractual Term (in years) |  |  |  | Intrinsic Value |
Balance at December 31, 2018 |  |  | 2,374,124 |  |  | $ | 2.54 |  |  |  |  |  |  |  |  |
Granted |  |  | 551,256 |  |  | $ | 2.20 |  |  |  |  |  |  |  |  |
Exercised |  |  | (24,494 | ) |  | $ | 0.95 |  |  |  |  |  |  |  |  |
Canceled |  |  | (508,100 | ) |  | $ | 2.92 |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 |  |  | 2,392,786 |  |  | $ | 2.40 |  |  |  |  |  |  |  |  |
Granted |  |  | 37,000 |  |  | $ | 1.08 |  |  |  |  |  |  |  |  |
Exercised |  |  | (100,239 | ) |  | $ | 1.68 |  |  |  |  |  |  |  |  |
Canceled |  |  | (334,741 | ) |  | $ | 2.84 |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 |  |  | 1,994,806 |  |  | $ | 2.42 |  |  |  | 5.50 |  |  | $ | 690,769 |
Exercisable |  |  | 1,602,695 |  |  | $ | 2.34 |  |  |  | 4.75 |  |  | $ | 603,382 |
Unvested |  |  | 392,111 |  |  | $ | 2.31 |  |  |  | 8.33 |  |  | $ | 87,387 |
Stock options outstanding as of December 31, 2020 are summarized below:
|  |  |  |  | Options Outstanding |  |  |  |  | Options Exercisable
| Range of Exercise Prices |  |  |  | Number of Options Outstanding |  |  |  | Weighted Average Remaining Life (Years) |  |  |  | Weighted Average Exercise Price |  |  |  | Number of Options Exercisable |  |  |  | Weighted Average Exercise Price |
| $0.95 - $1.25 |  |  |  | 352,081 |  |  |  | 3.25 |  |  | $ | 1.06 |  |  |  | 325,873 |  |  | $ | 1.06 |
| $1.50 - $1.82 |  |  |  | 99,540 |  |  |  | 1.00 |  |  | $ | 1.74 |  |  |  | 99,540 |  |  | $ | 1.74 |
| $1.89 - $2.27 |  |  |  | 456,891 |  |  |  | 5.17 |  |  | $ | 2.07 |  |  |  | 368,771 |  |  | $ | 2.11 |
| $2.32 - $2.49 |  |  |  | 407,826 |  |  |  | 7.58 |  |  | $ | 2.34 |  |  |  | 200,125 |  |  | $ | 2.35 |
| $2.50 - $2.75 |  |  |  | 241,188 |  |  |  | 5.33 |  |  | $ | 2.71 |  |  |  | 241,188 |  |  | $ | 2.71 |
| $2.82 - $2.93 |  |  |  | 195,355 |  |  |  | 7.17 |  |  | $ | 2.93 |  |  |  | 141,206 |  |  | $ | 2.93 |
| $3.10 - $3.88 |  |  |  | 73,400 |  |  |  | 6.00 |  |  | $ | 3.69 |  |  |  | 71,600 |  |  | $ | 3.70 |
| $4.22 - $4.49 |  |  |  | 168,525 |  |  |  | 6.42 |  |  | $ | 4.25 |  |  |  | 154,392 |  |  | $ | 4.24 |
| $0.95 - $4.49 |  |  |  | 1,994,806 |  |  |  | 5.50 |  |  | $ | 2.42 |  |  |  | 1,602,695 |  |  | $ | 2.34 |
As of December 31, 2020, the remaining unamortized stock option compensation expense was $383,720 and is expected to be amortized over a weighted average period of 1.92 years. Restricted stock – The restricted stocks are issued to employees and consultants and are held in escrow by the Company until the shares vest on the schedule of 15% after year one, 20% after year two, 25% after year three and 40% after year four, subject to the employees and consultants being a continuing service provider on the vesting dates. If the service or employment is terminated, unvested shares revert to the Company. Shares are registered at grant, so share owners may vote at the annual stockholder meeting. Restricted stocks are granted at zero cost basis. Compensation cost of the restricted stocks is recognized on a straight-line basis over the 4-year vesting period. The following summarizes information related to Restricted Stock activity under the 2004 Plan for the years ended December 31, 2020 and 2019:
|  |  | Number of Restricted Stocks |  | Weighted Average Price Per Share
Unvested as of December 31, 2018 |  |  | — |  | —
Granted |  |  | 127,871 |  | $ 1.94
Vested |  |  | — |  | —
Forfeited |  |  | (17,800) |  | $ 1.90
Unvested as of December 31, 2019 |  |  | 110,071 |  | $ 1.94
Granted |  |  | 392,680 |  | $ 1.50
Vested |  |  | (17,306) |  | $ 1.94
Forfeited |  |  | (43,245) |  | $ 1.60
Unvested as December 31, 2020 |  |  | 442,200 |  | $ 1.58
As of December 31, 2020, the remaining unamortized restricted stock compensation expense was $552,162 and is expected to be amortized over a weighted average period of 3.10 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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