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Note 5 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Cash $ 8,298 $ 7,135    
Restricted cash 91 270    
Total $ 8,389 $ 7,405 $ 6,816 $ 25,934