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Note 3 - Inventory - Carrying Values of Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Finished goods $ 25,947 $ 22,998
Work in process 1,642 1,735
Raw materials and supplies 39,727 27,143
Inventory, gross 67,316 51,876
LIFO reserve (7,791) (8,122)
Total inventory $ 59,525 $ 43,754