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Note 7 - Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2023
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | 7. Stock-Based Compensation 2019 Stock Plan On April 29, 2019, the Aemetis 2019 Stock Plan (the “2019 Stock Plan”) was approved by stockholders of the Company. This plan permits the grant of Incentive Stock Options, Non-Statutory Stock Options, Stock Appreciation Rights, Restricted Stock, Restricted Stock Units, Performance Units, Performance Shares and other stock or cash awards as the Administrator may determine in its discretion. The 2019 Stock Plan’s term is 10 years and supersedes all prior plans. The 2019 Stock Plan authorized the issuance of 200,000 shares of common stock for the 2019 calendar year, in addition to permitting transferring and granting any available and unissued or expired options under the Amended and Restated 2007 Stock Plan in an amount up to 177,246 shares of common stock. With the approval of the 2019 Stock Plan, the Zymetis 2006 Stock Plan, and Amended and Restated 2007 Stock Plan (collectively, the “Stock Plans”) were terminated for granting any options under either plan. However, any options granted before the 2019 Stock Plan approved will remain outstanding and can be exercised, and any expired options will be available to grant under the 2019 Stock Plan. Common Stock Reserved for Issuance The following is a summary of awards granted under the Stock Plans:
|  | Shares Available for Grant |  |  | Number of Shares Outstanding |  |  | Weighted-Average Exercise Price |
Balance as of December 31, 2022 |  |  | 165 |  |  |  | 4,694 |  |  | $ | 4.63 |
Authorized |  |  | 1,435 |  |  |  | - |  |  |  | - |
Options Granted |  |  | (1,178 | ) |  |  | 1,178 |  |  |  | 3.75 |
RSAs Granted |  |  | (244 | ) |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | (40 | ) |  |  | 0.69 |
Forfeited/expired |  |  | 62 |  |  |  | (62 | ) |  |  | 4.31 |
Balance as of March 31, 2023 |  |  | 240 |  |  |  | 5,770 |  |  | $ | 4.48 |
As of March 31, 2023, there were 3.4 million options vested under the Stock Plans. Stock-based compensation for employees Stock-based compensation is accounted for in accordance with the provisions of ASC 718 Compensation-Stock Compensation, which requires the measurement and recognition of compensation expense for all stock-based awards made to employees and directors based on estimated fair values on the grant date. We estimate the fair value of stock-based awards on the date of grant using the Black-Scholes option-pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service periods using the straight-line method. Valuation and Expense Information All issuances of stock options or other issuances of equity instruments to employees as the consideration for services received by us are accounted for based on the fair value of the equity instrument issued. The fair value of options granted to employees is estimated on the grant date using the Black-Scholes option valuation model. This valuation model for stock based compensation expense requires us to make assumptions and judgments about the variables used in the calculation, including the fair value of our common stock, the expected term (the period of time that the options granted are expected to be outstanding), the volatility of our common stock, a risk-free interest rate, and expected dividends. Under ASU 2016-09 Improvements to Employee Share-Based Payments Accounting, we have elected to recognize forfeitures as they occur. We use the simplified calculation of expected life described in the SEC’s Staff Accounting Bulletin No. 107, Share-Based Payment, and volatility is based on an average of the historical volatilities of the common stock of four entities with characteristics similar to those of the Company. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option. We use an expected dividend yield of zero, as we do not anticipate paying any dividends in the foreseeable future. Expected forfeitures are assumed to be zero due to the small number of plan participants. During the three months ended March 31, 2023 and 2022, the Company granted 1.2 million and 0.9 million options, respectively. The weighted average fair value calculations for the options granted during these periods are based on the following assumptions:
|  | For the three months ended March 31, 2023 |
Description |  | 2023 |  |  | 2022 |
Dividend-yield |  |  | - | % |  |  | - | %
Risk-free interest rate |  |  | 3.82 | % |  |  | 1.66 | %
Expected volatility |  |  | 125.32 | % |  |  | 113.45 | %
Expected life (years) |  |  | 7.00 |  |  |  | 7.00 |
Market value per share on grant date |  | $ | 3.75 |  |  | $ | 11.31 |
Fair value per option on grant date |  | $ | 3.43 |  |  | $ | 9.89 |
During the three months ended March 31, 2023 and 2022, the Company granted 24 3,850 and 60,300 restricted stock awards, respectively, with a fair value on date of grant of $3.75 and $11.31, respectively, per award. As of March 31, 2023, the Company had $12.8 million of total unrecognized compensation expense for employees, which the Company will amortize over the 2.1 years of weighted average remaining term.

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