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Note 4 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Cash $ 9,223 $ 5,634    
Restricted cash 78 79    
Total $ 9,301 $ 5,713 $ 5,051 $ 8,413