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Note 3 - Inventories (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Excess of Replacement or Current Costs over Stated LIFO Value $ 57.9us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue $ 55.3us-gaap_ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue
Inventory Valuation Reserves $ 4.6us-gaap_InventoryValuationReserves $ 3.8us-gaap_InventoryValuationReserves