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Note 13 - Other Financial Statement Information - Intangible Assets, Net (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Gross intangible assets | $ 214 | $ 214
Less: Accumulated amortization | (205) | (199)
Intangible assets, net | 9 | 15
Intellectual Property [Member] |  |
Gross intangible assets | $ 214 | $ 214

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