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Note 4 - Balance Sheet Components - Intangible Assets, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2021
Less: Accumulated amortization $ (6,599) $ (6,099)  
Total 1,386 1,886 $ 1,886
Acquired Patents and Licenses [Member]      
Acquired patents and licenses $ 7,985 $ 7,985