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Note 9 - Warrants to Purchase Common Stock | 12 Months Ended
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Dec. 31, 2024
Notes to Financial Statements |
Outstanding Warrants [Text Block] | 9. Warrants to Purchase Common Stock During 2024, the Company issued two subordinated lenders warrants exercisable for the purchase of 226,666 shares of common stock at an exercise price of $0.01 per share with a term of two years. These warrants were exercised in 2024 with a combination of cashless exercise and cash payments. The following table shows the weighted average fair value calculations for warrants granted based on the listed weighted average assumptions:
Description |  | For the year ended December 31, |
|  | 2024 |  |  | 2023 |
Dividend-yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 4.50 | % |  |  | 3.85 | %
Expected volatility |  |  | 99.86 | % |  |  | 117.90 | %
Expected life (years) |  |  | 2 |  |  |  | 5 |
Exercise price per share |  | $ | 0.01 |  |  | $ | 1.62 |
Market value per share on grant date |  | $ | 4.05 |  |  | $ | 4.13 |
Fair value per share on grant date |  | $ | 4.04 |  |  | $ | 3.92 |
The following table summarizes warrant activity for the years ended December 31, 2024 and 2023:
|  | Warrants Outstanding & Exercisable |  |  | Weighted - Average Exercise Price |  |  | Average Remaining Term in Years |
Outstanding December 31, 2022 |  |  | 355 |  |  | $ | 15.92 |  |  |  | 7.48 |
Granted |  |  | 511 |  |  |  | 1.62 |  |  |  |  |
Exercised |  |  | (336 | ) |  |  | 0.83 |  |  |  |  |
Outstanding December 31, 2023 |  |  | 530 |  |  | $ | 11.70 |  |  |  | 5.77 |
Granted |  |  | 226 |  |  |  | 0.01 |  |  |  |  |
Exercised |  |  | (226 | ) |  |  | 0.01 |  |  |  |  |
Outstanding December 31, 2024 |  |  | 530 |  |  | $ | 11.70 |  |  |  | 4.78 |
All of the above outstanding warrants are vested and exercisable as of December 31, 2024.

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