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Consolidated Statements of Income (Loss) - USD ($)
shares in Thousands
 12 Months Ended
May 27, 2018
May 28, 2017
May 29, 2016
Product sales $ 524,227,000 $ 469,776,000 $ 476,918,000
Cost of product sales 445,889,000 390,564,000 410,137,000
Gross profit 78,338,000 79,212,000 66,781,000
Operating costs and expenses:      
Research and development 12,800,000 9,473,000 7,228,000
Selling, general and administrative 51,951,000 52,491,000 46,181,000
Legal settlement charge 2,580,000
Impairment of GreenLine trade name 0 0 34,000,000
Total operating costs and expenses 64,751,000 64,544,000 87,409,000
Operating income (loss) 13,587,000 14,668,000 (20,628,000)
Dividend income 1,650,000 1,650,000 1,650,000
Interest income 211,000 16,000 71,000
Interest expense, net (1,950,000) (1,826,000) (1,987,000)
Loss on debt refinancing (1,233,000)
Other income 2,900,000 900,000 1,200,000
Net income (loss) from continuing operations before taxes 16,398,000 14,175,000 (19,694,000)
Income tax benefit (expense) 9,363,000 (4,040,000) 7,704,000
Net income (loss) from continuing operations 25,761,000 10,135,000 (11,990,000)
(Loss) income from discontinued operations (1,188,000) 837,000 842,000
Income tax benefit (expense) 350,000 (295,000) (300,000)
(Loss) income from discontinued operations, net of tax (838,000) 542,000 542,000
Consolidated net income (loss) 24,923,000 10,677,000 (11,448,000)
Non-controlling interest expense (94,000) (87,000) (193,000)
Net income (loss) applicable to common stockholders $ 24,829,000 $ 10,590,000 $ (11,641,000)
Basic net income (loss) per share:      
Net income per basic share from continuing operations (in dollars per share) $ 0.93 $ 0.37 $ (0.45)
(Loss) income from discontinued operations (in dollars per share) (0.03) 0.02 0.02
Total basic net income (loss) per share (in dollars per share) 0.90 0.39 (0.43)
Net income per diluted share from continuing operations (in dollars per share) 0.92 0.36 (0.45)
(Loss) income from discontinued operations (in dollars per share) (0.03) 0.02 0.02
Total diluted net income (loss) per share (in dollars per share) $ 0.89 $ 0.38 $ (0.43)
Basic (in shares) 27,535 27,276 27,044
Diluted (in shares) 27,915 27,652 27,044