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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Aug. 28, 2016 | Aug. 30, 2015
Product sales | $ 132,394 | $ 135,355
Cost of product sales | 111,250 | 117,378
Gross profit | 21,144 | 17,977
Operating costs and expenses: |  |
Research and development | 1,938 | 1,875
Selling, general and administrative | 13,736 | 12,165
Total operating costs and expenses | 15,674 | 14,040
Operating income | 5,470 | 3,937
Dividend income | 413 | 413
Interest income | 4 | 31
Interest expense | (653) | (502)
Other income |  | 800
Net income before taxes | 5,234 | 4,679
Income tax expense | (1,889) | (1,691)
Consolidated net income | 3,345 | 2,988
Non-controlling interest | (33) | (36)
Net income and comprehensive income applicable to common stockholders | $ 3,312 | $ 2,952
Basic net income per share (in dollars per share) | $ 0.12 | $ 0.11
Diluted net income per share (in dollars per share) | $ 0.12 | $ 0.11
Shares used in per share computation: |  |
Basic (in shares) | 27,219 | 27,005
Diluted (in shares) | 27,521 | 27,409

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