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Note 4 - Balance Sheet Components - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Less: Accumulated amortization $ (7,264) $ (6,765)
Total 741 1,220
Acquired Patents and Licenses [Member]    
Acquired patents and licenses $ 8,005 $ 7,985