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Note C - Inventories (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Excess of Replacement or Current Costs over Stated LIFO Value $ 59,100,000 $ 57,900,000
Inventory, LIFO Reserve, Effect on Income, Net (363,000)  
Inventory Valuation Reserves $ 5,000,000 $ 4,600,000