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Note 4 - Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Raw materials $ 29,564 $ 34,426
Work-in-process 1,515 2,368
Finished goods 915 1,075
Supplies 1,519 1,507
Total inventories $ 33,513 $ 39,376