Note 4 - Property and Equipment, Net - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Property and equipment, gross | $ 804 | $ 801 |
| Less accumulated depreciation | (791) | (785) |
| Property and equipment, net | 13 | 16 |
| Computer Equipment and Software [Member] | ||
| Property and equipment, gross | 174 | 172 |
| Laboratory and Manufacturing Equipment [Member] | ||
| Property and equipment, gross | 577 | 576 |
| Furniture and Fixtures [Member] | ||
| Property and equipment, gross | 27 | 27 |
| Leasehold Improvements [Member] | ||
| Property and equipment, gross | $ 26 | $ 26 |
| X | ||||||||||
- Definition Amount of accumulated depreciation, depletion, and amortization of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, before accumulated depreciation, depletion, and amortization, of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after accumulated depreciation, depletion, and amortization, of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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