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Note 5 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash $ 7,135 $ 25,583  
Restricted cash 270 351  
Total $ 7,405 $ 25,934 $ 18,330