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Note 4 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Cash $ 15,740 $ 10,562    
Restricted cash 88 91    
Total $ 15,828 $ 10,653 $ 8,389 $ 7,405