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Note 5 - Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Raw materials $ 26,772 $ 34,426
Work-in-process 1,579 2,368
Finished goods 683 1,075
Supplies 1,620 1,507
Total inventories $ 30,654 $ 39,376