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Note 7 - Income Taxes - Components of Losses Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Loss before income tax $ 21,842 $ 36,117 $ 64,638
CAYMAN ISLANDS      
Net loss before income taxes 2,100 3,522 5,652
UNITED STATES      
Net loss before income taxes 8,305 13,144 34,318
CHINA      
Net loss before income taxes 2,674 7,253 6,368
VIRGIN ISLANDS, BRITISH      
Net loss before income taxes 8,757 12,831 18,336
AUSTRALIA      
Net loss before income taxes $ 6 $ (633) $ (36)