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Note 4 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash $ 8,329 $ 10,562  
Restricted cash 84 91  
Total $ 8,413 $ 10,653 $ 7,405