Note 7 - Stockholders' Equity - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Outstanding (in shares) | 52,040 | 7,293 |
| Outstanding, weighted average grant date fair value (in dollars per share) | $ 34.26 | $ 324.64 |
| Granted (in shares) | 871,928 | 142,730 |
| Granted, weighted average grant date fair value (in dollars per share) | $ 0.95 | $ 1.54 |
| Vested and released (in shares) | (36,244) | (78,825) |
| Vested and released, weighted average grant date fair value (in dollars per share) | $ 1.15 | $ 5.07 |
| Outstanding (in shares) | 803,850 | 70,040 |
| Outstanding, weighted average grant date fair value (in dollars per share) | $ 0.99 | $ 26.58 |
| Vested (in shares) | 14,637 | 1,243 |
| Vested, weighted average grant date fair value (in dollars per share) | $ 3.02 | $ 1,363.11 |
| Unvested (in shares) | 789,213 | 68,797 |
| Unvested, weighted average grant date fair value (in dollars per share) | $ 0.95 | $ 2.43 |
| X | ||||||||||
- Definition Represents the weighted average grant date fair value for equity instruments other than options vested and released. No definition available.
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| X | ||||||||||
- Definition Represents the number of non option equity instruments vested and released. No definition available.
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| X | ||||||||||
- Definition Weighted average grant date fair value of equity instruments other than options outstanding, including both vested and non-vested instruments. No definition available.
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| X | ||||||||||
- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Net number of non-option equity instruments granted to participants. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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