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Note C - Inventories (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Excess of Replacement or Current Costs over Stated LIFO Value $ 58,400,000 $ 59,100,000
Inventory, LIFO Reserve, Effect on Income, Net 801,000  
Inventory Valuation Reserves $ 4,500,000 $ 5,000,000