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Note 4 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash $ 15,766 $ 10,562    
Restricted cash 87 91    
Total $ 15,853 $ 10,653 $ 13,777 $ 7,405