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Note 4 - Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Raw materials $ 44,697 $ 20,631
Work-in-process 3,018 1,416
Finished goods 10,096 5,489
Supplies 1,840 1,641
Total inventories $ 59,651 $ 29,177