Note 4 - Certain Balance Sheet Components - Summary of Property and Equipment (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Property, plant and equipment, gross | $ 807 | $ 782 |
| Less: accumulated depreciation | (645) | (599) |
| Property and equipment, net | 162 | 183 |
| Equipment [Member] | ||
| Property, plant and equipment, gross | 700 | 675 |
| Furniture and Fixtures [Member] | ||
| Property, plant and equipment, gross | 6 | 6 |
| Leasehold Improvements [Member] | ||
| Property, plant and equipment, gross | $ 101 | $ 101 |
| 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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| X | ||||||||||
- 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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| X | ||||||||||
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