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Note 4 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash $ 5,634 $ 8,329  
Restricted cash 79 84  
Total $ 5,713 $ 8,413 $ 10,653