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Consolidated Condensed Statements of Operations and Retained Earnings (Unaudited) (Parenthetical) (USD $)
In Thousands
3 Months Ended9 Months Ended
Oct. 01, 2011
Oct. 02, 2010
Oct. 01, 2011
Oct. 02, 2010
Costs and Expenses:    
Interest income$ 82$ 7$ 96$ 24