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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
May. 31, 2015
May. 25, 2014
May. 26, 2013
Product sales $ 539,257 $ 476,813 $ 441,708
Cost of product sales 473,850 414,249 378,948
Gross profit 65,407 62,564 62,760
Operating costs and expenses:      
Research and development 6,988 7,204 9,294
Selling, general and administrative $ 39,958 $ 35,170 32,531
Other operating expenses     (3,933)
Total operating costs and expenses $ 46,946 $ 42,374 37,892
Operating income 18,461 20,190 24,868
Dividend income 1,417 1,125 1,125
Interest income 315 260 179
Interest expense (1,829) (1,650) (2,008)
Other income 3,107 10,000 8,100
Net income before taxes 21,471 29,925 32,264
Income tax expense (7,746) (10,583) (9,452)
Consolidated net income 13,725 19,342 22,812
Non-controlling interest (181) (197) (225)
Net income and comprehensive income applicable to common stockholders $ 13,544 $ 19,145 $ 22,587
Basic net income per share (in dollars per share) $ 0.50 $ 0.72 $ 0.87
Diluted net income per share (in dollars per share) $ 0.50 $ 0.71 $ 0.85
Shares used in per share computation:      
Basic (in shares) 26,884 26,628 25,830
Diluted (in shares) 27,336 27,120 26,626