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Note 6 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Apr. 01, 2018
Dec. 31, 2017
Cash $ 20,929 $ 25,583    
Restricted Cash 311 351    
Total $ 21,240 $ 25,934 $ 18,330 $ 18,330