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Note 6 - Inventory (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory, Net, Total $ 31,421 $ 39,032
SUSTOL [Member]    
Inventory, Net, Total 4,200 6,700
CINVANTI [Member]    
Inventory, Net, Total $ 27,200 $ 32,300