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Note 5 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 29, 2019
Dec. 31, 2018
Cash $ 13,690 $ 7,135    
Restricted cash 87 270    
Total $ 13,777 $ 7,405 $ 7,089 $ 25,934