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Note 4 - Inventories (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Inventory, LIFO Reserve $ 62.5 $ 63.5
Inventory, LIFO Reserve, Effect on Income, Net, Total 2.0  
Inventory Valuation Reserves, Ending Balance $ 5.9 $ 5.9