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Note 6 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2017
Cash $ 6,528 $ 25,583    
Restricted cash 288 351    
Total $ 6,816 $ 25,934 $ 20,749 $ 18,330