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Note A - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Percentage of LIFO Inventory 72.00% 73.00%  
Depreciation $ 13,800 $ 13,800 $ 13,200
Goodwill, Impairment Loss 1,800 0 0
Advertising Expense $ 2,800 $ 3,200 $ 3,500