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Note 10 - Inventories - Summary of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Finished goods $ 34,306 $ 34,899
Raw materials, equipment spares and consumables 88,658 76,025
Work-in-progress 20,308 14,192
Total $ 143,272 $ 125,116