Note 10 - Segment Information - Summary of Segment Loss (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Mar. 31, 2026 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Revenue | $ 0 | $ 0 | $ 0 | $ (27) | ||||||
| Discontinued operations | 0 | 0 | 0 | (73) | ||||||
| Segment and condensed consolidated net loss | (4,312) | $ (2,556) | (3,489) | $ (2,593) | (6,868) | (6,082) | ||||
| Single Reportable Segments [Member] | ||||||||||
| Revenue | 0 | 0 | 0 | (27) | ||||||
| Employee expense (not including stock-based compensation) | 1,537 | 1,634 | 3,172 | 2,972 | ||||||
| Development and clinical trial expense | 973 | 732 | 1,892 | 1,190 | ||||||
| Other general and administrative expense | [1] | 818 | 1,151 | 1,894 | 2,078 | |||||
| Other segment income, net | [2] | 984 | (28) | (90) | (58) | |||||
| Discontinued operations | 0 | 0 | 0 | (73) | ||||||
| Segment and condensed consolidated net loss | $ (4,312) | $ (3,489) | $ (6,868) | $ (6,082) | ||||||
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| X | ||||||||||
- Definition Amount of development and clinical trial expense. No definition available.
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| X | ||||||||||
- Definition Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of selling, general and administrative expense classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of other expense (income) and loss (gain) calculated as difference between segment revenue and separately disclosed expense category to arrive at segment profit (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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