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Note 3 - Supplemental Balance Sheet Information - Cash and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash $ 25,583 $ 18,241  
Restricted Cash 351 89  
Total $ 25,934 $ 18,330 $ 10,706