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Note A - Summary of Significant Accounting Policies (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
May 31, 2011
Stock Split B (Member)
May 31, 2010
Stock Split B (Member)
Stock Split Conversion Ratio       three-for-two three-for-two
Addtional Shares Issued Due To Stock Split       one  
Common Stock Shares Owned Prior To Stock Split       two  
Cash Equivalents, at Carrying Value $ 57,652 $ 32,145      
Amortization of Debt Discount (Premium) 1,119 1,148      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares)     22,500    
Advertising Expense 7,312 5,597 4,713    
Shipping, Handling and Transportation Costs 12,190 10,409 8,488    
Business Exit Costs 232   1,541    
Defined Benefit Plan Matching Contribution Percentage Of Employees Contributions 50.00%        
Defined Benefit Plan Maximum Percentage To Be Matched Of Employees Compensation 6.00%        
Pension Expense $ 844 $ 675 $ 601