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Note 4 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Cash $ 8,202 $ 5,634    
Restricted cash 81 79    
Total $ 8,283 $ 5,713 $ 5,114 $ 8,413