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Note 8 - Inventories - Summary of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Raw materials $ 12,751 $ 13,688
Work-in-process 5,972 4,626
Finished goods 7,536 6,819
Total 26,259 25,133
Inventories, net 22,617 21,300
Inventory, Noncurrent, Total $ 3,642 $ 3,833