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Note 12 - Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2026
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
General and administrative |  | $ | 606 |  |  | $ | 538 |  |  | $ | 1,125 |  |  | $ | 1,216 |
Research and development |  |  | 512 |  |  |  | 233 |  |  |  | 815 |  |  |  | 422 |
Total share-based compensation |  | $ | 1,118 |  |  | $ | 771 |  |  | $ | 1,940 |  |  | $ | 1,638 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Shares Underlying Options |  |  | Weighted Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value |
Balances at December 31, 2025 |  |  | 6,864,854 |  |  | $ | 4.11 |  |  | $ | 26,479 |
Granted |  |  | 2,029,249 |  |  |  | 6.03 |  |  |  |  |
Forfeitures |  |  | (464,459 | ) |  |  | 4.25 |  |  |  |  |
Exercised |  |  | (181,649 | ) |  |  | 3.06 |  |  |  |  |
Expired |  |  | (67,500 | ) |  |  | 2.11 |  |  |  |  |
Balances at June 30, 2026 |  |  | 8,180,495 |  |  | $ | 4.61 |  |  | $ | 20,260 |
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
|  |  |  | Outstanding, Vested and Expected to Vest |  |  | Options Vested and Exercisable |
Per Share Exercise Price |  | Shares |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Weighted Average Exercise Price |  |  | Options Exercisable |  |  | Weighted Average Remaining Contractual Life (Years) |
$1.00 | - | $1.99 |  |  | 51,443 |  |  |  | 6.6 |  |  | $ | 1.64 |  |  |  | 48,318 |  |  |  | 6.6 |
$2.00 | - | $2.99 |  |  | 2,016,923 |  |  |  | 6.4 |  |  |  | 2.75 |  |  |  | 1,537,218 |  |  |  | 6.4 |
$3.00 | - | $3.99 |  |  | 223,107 |  |  |  | 3.5 |  |  |  | 3.67 |  |  |  | 206,233 |  |  |  | 3.1 |
$4.00 | - | $4.99 |  |  | 2,764,219 |  |  |  | 7.1 |  |  |  | 4.33 |  |  |  | 1,229,019 |  |  |  | 5.4 |
$5.00 | - | $5.99 |  |  | 2,168,536 |  |  |  | 8.3 |  |  |  | 5.72 |  |  |  | 272,101 |  |  |  | 5.5 |
$6.00 | - | $10.00 |  |  | 956,267 |  |  |  | 8.4 |  |  |  | 7.24 |  |  |  | 143,792 |  |  |  | 3.1 |
|  |  |  |  | 8,180,495 |  |  |  | 7.3 |  |  | $ | 4.61 |  |  |  | 3,436,681 |  |  |  | 5.6 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: 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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