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Note 10 - Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 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, 2022 |  |  | 65 |  |  |  | 4,694 |  |  | $ | 4.63 |
Authorized |  |  | 1,644 |  |  |  | - |  |  |  | - |
Options Granted |  |  | (1,278 | ) |  |  | 1,278 |  |  |  | 3.60 |
RSAs Granted |  |  | (244 | ) |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | (177 | ) |  |  | 1.83 |
Forfeited/expired |  |  | 269 |  |  |  | (269 | ) |  |  | 5.93 |
Balance as of December 31, 2023 |  |  | 456 |  |  |  | 5,526 |  |  | $ | 4.42 |
Authorized |  |  | 1,740 |  |  |  | - |  |  |  | - |
Options Granted |  |  | (1,776 | ) |  |  | 1,776 |  |  |  | 3.10 |
RSAs Granted |  |  | (428 | ) |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | (15 | ) |  |  | 2.56 |
Forfeited/expired |  |  | 86 |  |  |  | (86 | ) |  |  | 6.89 |
Balance as of December 31, 2024 |  |  | 78 |  |  |  | 7,201 |  |  | $ | 4.06 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Remaining Contractual Term (In Years) |  |  | Aggregate Intrinsic Value1 |
2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested and Exercisable |  |  | 5,245 |  |  | $ | 4.17 |  |  |  | 6.08 |  |  | $ | 4,021 |
Unvested |  |  | 1,955 |  |  |  | 3.80 |  |  |  | 8.68 |  |  |  | 47 |
Total |  |  | 7,201 |  |  | $ | 4.06 |  |  |  | 7.55 |  |  | $ | 4,068 |
2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested and Exercisable |  |  | 3,986 |  |  | $ | 3.58 |  |  |  | 6.47 |  |  | $ | 11,695 |
Unvested |  |  | 1,540 |  |  |  | 6.55 |  |  |  | 8.67 |  |  |  | 1,621 |
Total |  |  | 5,526 |  |  | $ | 4.42 |  |  |  | 7.04 |  |  | $ | 13,316 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Description |  | For the year ended December 31, |
|  | 2024 |  |  | 2023 |
Dividend-yield |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 3.93 | % |  |  | 3.86 | %
Expected volatility |  |  | 115.41 | % |  |  | 124.62 | %
Expected life (years) |  |  | 5.81 |  |  |  | 7.00 |
Market value per share on grant date |  | $ | 3.10 |  |  | $ | 3.60 |
Fair value per share on grant date |  | $ | 2.65 |  |  | $ | 3.29 |

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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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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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