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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Aug. 27, 2017
Aug. 28, 2016
Product sales $ 123,357 $ 132,394
Cost of product sales 104,071 111,250
Gross profit 19,286 21,144
Operating costs and expenses:    
Research and development 2,719 1,938
Selling, general and administrative 14,045 13,736
Total operating costs and expenses 16,764 15,674
Operating income 2,522 5,470
Dividend income 413 413
Interest income 31 4
Interest expense (404) (653)
Other income 900
Net income before taxes 3,462 5,234
Income tax expense (1,250) (1,889)
Consolidated net income 2,212 3,345
Non-controlling interest expense (66) (33)
Net income applicable to common stockholders $ 2,146 $ 3,312
Basic net income per share (in dollars per share) $ 0.08 $ 0.12
Diluted net income per share (in dollars per share) $ 0.08 $ 0.12
Shares used in per share computation    
Basic (in shares) 27,506 27,219
Diluted (in shares) 27,858 27,521
Other comprehensive loss, net of tax:    
Change in net unrealized gains on interest rate swap (net of tax benefit of $57) $ (103)
Other comprehensive income, net (103)
Total comprehensive income $ 2,043 $ 3,312