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Note 3 - Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Raw materials $ 47,297 $ 44,697
Work-in-process 2,905 3,018
Finished goods 10,620 10,096
Supplies 1,886 1,840
Total inventories $ 62,708 $ 59,651