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Note 4 - Inventories - Components of Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Raw materials $ 37,381 $ 34,426
Work-in-process 1,409 2,368
Finished goods 824 1,075
Supplies 1,502 1,507
Total current inventories $ 41,116 $ 39,376