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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
shares in Thousands
 3 Months Ended 6 Months Ended
Nov. 29, 2015
Nov. 30, 2014
Nov. 29, 2015
Nov. 30, 2014
Product sales $ 140,441,000 $ 132,665,000 $ 275,796,000 $ 266,279,000
Cost of product sales 123,176,000 116,999,000 240,554,000 236,425,000
Gross profit 17,265,000 15,666,000 35,242,000 29,854,000
Operating costs and expenses:        
Research and development 1,643,000 1,825,000 3,518,000 3,620,000
Selling, general and administrative 12,815,000 9,949,000 24,979,000 18,808,000
Total operating costs and expenses 14,458,000 11,774,000 28,497,000 22,428,000
Operating income 2,807,000 3,892,000 6,745,000 7,426,000
Dividend income 413,000 321,000 825,000 602,000
Interest income 16,000 91,000 47,000 184,000
Interest expense (439,000) (472,000) (941,000) (855,000)
Other income 200,000 1,200,000 1,000,000 1,400,000
Net income before taxes 2,997,000 5,032,000 7,676,000 8,757,000
Income tax expense (1,069,000) (1,785,000) (2,760,000) (3,086,000)
Consolidated net income 1,928,000 3,247,000 4,916,000 5,671,000
Non-controlling interest (60,000) (24,000) (96,000) (95,000)
Net income and comprehensive income applicable to common stockholders $ 1,868,000 $ 3,223,000 $ 4,820,000 $ 5,576,000
Basic net income per share (in dollars per share) $ 0.07 $ 0.12 $ 0.18 $ 0.21
Diluted net income per share (in dollars per share) $ 0.07 $ 0.12 $ 0.18 $ 0.20
Shares used in per share computation        
Basic (in shares) 27,021 26,864 27,013 26,852
Diluted (in shares) 27,420 27,314 27,417 27,293