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Note 10 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Notes Tables |
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] |
|  | Shares Available for Grant |  |  | Number of Shares Outstanding |  |  | Weighted-Average Exercise Price |
Balance as of December 31, 2023 |  |  | 456 |  |  |  | 5,526 |  |  | $ | 4.42 |
Authorized |  |  | 1,740 |  |  |  | - |  |  |  | - |
Options Granted |  |  | (1,761 | ) |  |  | 1,761 |  |  |  | 3.10 |
RSAs Granted |  |  | (364 | ) |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | (14 | ) |  |  | 2.54 |
Forfeited/expired |  |  | 61 |  |  |  | (61 | ) |  |  | 6.97 |
Balance as of March 31, 2024 |  |  | 132 |  |  |  | 7,212 |  |  | $ | 4.08 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | For the three months ended March 31, |
Description |  | 2024 |  |  | 2023 |
Dividend-yield |  |  | - |  |  |  | - |
Risk-free interest rate |  |  | 4.08 | % |  |  | 3.82 | %
Expected volatility |  |  | 115.42 | % |  |  | 125.32 | %
Expected life (years) |  |  | 5.81 |  |  |  | 7.00 |
Market value per share on grant date |  | $ | 3.10 |  |  | $ | 3.75 |
Fair value per option on grant date |  | $ | 2.65 |  |  | $ | 3.43 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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