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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
May 26, 2019
May 27, 2018
May 28, 2017
Income Statement [Abstract]      
Product sales $ 557,559 $ 524,227 $ 469,776
Cost of product sales 476,556 445,889 390,564
Gross profit 81,003 78,338 79,212
Operating costs and expenses:      
Research and development 11,466 12,800 9,473
Selling, general and administrative 64,062 51,951 52,491
Legal settlement charge 0 0 2,580
Total operating costs and expenses 75,528 64,751 64,544
Operating income 5,475 13,587 14,668
Dividend income 1,650 1,650 1,650
Interest income 145 211 16
Interest expense, net (5,230) (1,950) (1,826)
Loss on debt refinancing 0 0 (1,233)
Other income 1,600 2,900 900
Net income from continuing operations before taxes 3,640 16,398 14,175
Income tax (expense) benefit (1,518) 9,363 (4,040)
Net income from continuing operations 2,122 25,761 10,135
Discontinued operations:      
(Loss) income from discontinued operations (2,238) (1,188) 837
Income tax benefit (expense) 527 350 (295)
(Loss) income from discontinued operations, net of tax (1,711) (838) 542
Consolidated net income 411 24,923 10,677
Non-controlling interest expense 0 (94) (87)
Net income applicable to common stockholders $ 411 $ 24,829 $ 10,590
Basic net income per share:      
Income from continuing operations (in dollars per share) $ 0.07 $ 0.93 $ 0.37
(Loss) income from discontinued operations (in dollars per share) (0.06) (0.03) 0.02
Total basic net income per share (in dollars per share) 0.01 0.90 0.39
Diluted net income per share:      
Income from continuing operations (in dollars per share) 0.07 0.92 0.36
(Loss) income from discontinued operations (in dollars per share) (0.06) (0.03) 0.02
Total diluted net income per share (in dollars per share) $ 0.01 $ 0.89 $ 0.38
Shares used in per share computation:      
Basic (in shares) 28,359 27,535 27,276
Diluted (in shares) 28,607 27,915 27,652