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Note 4 - Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Raw materials $ 23,103 $ 34,426
Work-in-process 1,616 2,368
Finished goods 937 1,075
Supplies 1,631 1,507
Total inventories $ 27,287 $ 39,376