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Note 5 - Stock-based Compensation | 12 Months Ended
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Dec. 31, 2023
Notes to Financial Statements |
Shareholders' Equity and Share-Based Payments [Text Block] | Note 5 – Stock-Based Compensation We recorded non-cash stock compensation expense in each period as follows:
|  | Year ended December 31, |
|  | 2023 |  |  | 2022 |
Stock options |  | $ | 522 |  |  | $ | 761 |
Restricted stock |  |  | 6 |  |  |  | 15 |
Total |  | $ | 528 |  |  | $ | 776 |
We have various stock-based employee compensation plans, for which compensation cost is recognized in the financial statements. The cost is measured at the grant date, based on the estimated fair value of the award, and is recognized as an expense over the employee’s requisite service period (generally the vesting period of the equity award). Our stockholders have approved various equity-based plans that permit the grant of stock options, restricted stock and other equity-based awards. In addition, our stockholders have approved the grant of stock options outside of these plans. In June 2014, our stockholders approved the 2014 Long-Term Incentive Plan (“2014 LTIP”) as the successor plan to the 2004 Long-Term Incentive Plan (“2004 LTIP”) that expired on June 10, 2014. Under the 2014 LTIP, a total of 1,750,000 shares of common stock were made available for grant of awards. In July 2021, our stockholders approved an amendment to the 2014 LTIP to increase the total number shares of our common stock authorized to be issued pursuant to the 2014 LTIP to 2,750,000. Of the total number of shares of common stock available for awards under the 2014 LTIP, no more than 800,000 shares of common stock may be used for awards other than stock options and stock appreciation rights. Grants under the 2014 LTIP may be awarded through June 2, 2024. Stock options granted under the 2014 LTIP are either Incentive Stock Options (“ISOs”) or Non-Qualified Stock Options (“NQSOs”). Key employees are eligible to receive ISOs and NQSOs; however, directors and consultants are eligible to receive only NQSOs. Stock options vest in equal installments on the first, second and third anniversaries of the grant date and expire on the seventh anniversary of the grant date. As of December 31, 2023, there were 1,250,595 stock options outstanding under the 2014 LTIP. There were no stock options outstanding under the 2004 LTIP. As of December 31, 2023, there was $844 of total unrecognized compensation costs related to outstanding stock options, which we expect to recognize over a weighted average period of 1.5 years. We use the Black-Scholes option-pricing model to estimate fair value of stock-based awards. The following weighted average assumptions were used to value options granted during the years ended December 31, 2023 and 2022:
|  | Year ended December 31, |
|  | 2023 |  |  | 2022 |
Risk-free interest rate |  |  | 4.1 | % |  |  | 4.2 | %
Volatility factor |  |  | 57 | % |  |  | 50 | %
Weighted average expected life (years) |  |  | 4.9 |  |  |  | 4.8 |
Forfeiture rate |  |  | 10.0 | % |  |  | 10.0 | %
Dividends |  |  | 0.0 | % |  |  | 0.0 | %
We used a Monte Carlo simulation option-pricing model to estimate the fair value of market performance stock-based awards, of which there were no new awards for the years ended December 31, 2023 and 2022. We calculate expected volatility for stock options by taking an average of historical volatility over the expected term. The computation of expected term was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards and vesting schedules. The interest rate for periods within the contractual life of the award is based on the U.S. Treasury yield in effect at the time of grant. Forfeiture rates are calculated by dividing unvested shares forfeited by beginning shares outstanding. The pre-vesting forfeiture rate is calculated yearly and is determined based on historical experience. The following tables summarize data for the stock options issued by us:
Year ended December 31, 2023 |
|  | Number of shares |  |  | Weighted average exercise price per share |  |  | Weighted average remaining contractual term |  |  | Aggregate intrinsic value |
Shares under option – January 1 |  |  | 1,425,693 |  |  | $ | 6.72 |  |  |  |  |  |  |  |  |
Options granted |  |  | 231,650 |  |  |  | 6.69 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (254,393 | ) |  |  | 5.83 |  |  |  |  |  |  |  |  |
Options forfeited or expired |  |  | (152,355 | ) |  |  | 5.06 |  |  |  |  |  |  |  |  |
Shares under option – December 31 |  |  | 1,250,595 |  |  | $ | 7.10 |  |  |  | 3.97 |  |  | $ | 515 |
Vested and expected to vest - December 31 |  |  | 1,151,228 |  |  | $ | 7.17 |  |  |  | 3.79 |  |  | $ | 452 |
Options exercisable – December 31 |  |  | 789,209 |  |  | $ | 7.56 |  |  |  | 2.69 |  |  | $ | 241 |
Year ended December 31, 2022 |
|  | Number of shares |  |  | Weighted average exercise price per share |
Shares under option – January 1 |  |  | 1,306,824 |  |  | $ | 6.87 |
Options granted |  |  | 289,950 |  |  |  | 5.42 |
Options exercised |  |  | (59,500 | ) |  |  | 3.82 |
Options forfeited or expired |  |  | (111,581 | ) |  |  | 6.56 |
Shares under option – December 31 |  |  | 1,425,693 |  |  | $ | 6.72 |
Options exercisable – December 31 |  |  | 881,804 |  |  | $ | 7.13 |
The following table represents additional information about stock options outstanding at December 31, 2023:
|  |  |  | Option outstanding |  |  | Options exercisable |
Range of exercise prices |  | Number of outstanding options |  |  | Weighted- average remaining contractual life |  |  | Weighted- average exercise price |  |  | Number of options exercisable |  |  | Weighted- average exercise price |
$4.07 | - | $6.36 |  |  | 338,364 |  |  |  | 4.79 |  |  | $ | 5.42 |  |  |  | 156,099 |  |  | $ | 5.54 |
$6.51 | - | $6.84 |  |  | 353,733 |  |  |  | 5.54 |  |  |  | 6.71 |  |  |  | 134,583 |  |  |  | 6.51 |
$6.97 | - | $8.25 |  |  | 334,165 |  |  |  | 2.89 |  |  |  | 7.64 |  |  |  | 290,355 |  |  |  | 7.74 |
$8.45 | - | $9.96 |  |  | 224,333 |  |  |  | 1.88 |  |  |  | 9.44 |  |  |  | 208,172 |  |  |  | 9.51 |
$4.07 | - | $9.96 |  |  | 1,250,595 |  |  |  | 3.97 |  |  | $ | 7.10 |  |  |  | 789,209 |  |  | $ | 7.56 |
The weighted average fair value of options granted during the years ended December 31, 2023 and 2022 was $3.48 and $2.55, respectively. The total intrinsic value of options (which is the amount by which the stock price exceeded the exercise price of the options on the date of exercise) exercised during the years ended December 31, 2023 and 2022 was $556 and $88, respectively. Cash received from stock option exercises under our stock-based compensation plans for the years ended December 31, 2023 and 2022 was $1,248 and $116, respectively. Restricted shares vest in equal annual installments over three years. In November 2023, we granted 4,029 shares of restricted stock awards. As of December 31, 2023, there was $27 of total unrecognized compensation costs related to outstanding restricted shares. There were 632,593 shares of common stock available for future issuance under equity compensation plans as of December 31, 2023.

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