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Note 3 - Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Raw materials $ 35,245 $ 20,631
Work-in-process 932 1,416
Finished goods 5,018 5,489
Supplies 1,847 1,641
Total inventories $ 43,042 $ 29,177