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Note 4 - Inventories (Details Textual) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Percentage of LIFO Inventory 71.00% 72.00%
Inventory, LIFO Reserve $ 62.9 $ 59.7
Inventory Valuation Reserves, Ending Balance $ 5.2 $ 4.9