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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Aug. 31, 2014
Aug. 25, 2013
Product sales $ 133,614 $ 109,479
Cost of product sales 119,426 96,947
Gross profit 14,188 12,532
Operating costs and expenses:    
Research and development 1,795 1,926
Selling, general and administrative 8,859 8,630
Total operating costs and expenses 10,654 10,556
Operating income 3,534 1,976
Dividend income 281 281
Interest income 93 60
Interest expense (383) (431)
Other income 200 5,400
Net income before taxes 3,725 7,286
Income tax expense (1,301) (2,475)
Consolidated net income 2,424 4,811
Non-controlling interest (71) (59)
Net income and comprehensive income applicable to common stockholders $ 2,353 $ 4,752
Basic net income per share (in Dollars per share) $ 0.09 $ 0.18
Diluted net income per share (in Dollars per share) $ 0.09 $ 0.18
Basic (in Shares) 26,840 26,452
Diluted (in Shares) 27,267 27,081