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Note 4 - Balance Sheet Details (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Asset Impairment Charges $ 0 $ 0  
Inventory, Net 10,108 5,340  
Depreciation 1,500 1,100 $ 700
Construction in Progress, Gross 2,000 1,700  
SUSTOL [Member]      
Inventory, Net 7,100 $ 5,300  
CINVANTI [Member]      
Inventory, Net $ 3,000