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Note 4 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Cash $ 13,574 $ 10,562    
Restricted cash 88 91    
Total $ 13,662 $ 10,653 $ 6,109 $ 7,405