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Note 3 - Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Raw materials $ 30,273 $ 26,772
Work-in-process 2,261 1,579
Finished goods 5,097 683
Supplies 1,628 1,620
Total inventories $ 39,259 $ 30,654