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Consolidated Statements of Comprehensive Income (Unaudited) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2014 | Nov. 24, 2013 | Nov. 30, 2014 | Nov. 24, 2013
Revenue | $ 132,665,000 us-gaap_SalesRevenueGoodsNet | $ 120,026,000 us-gaap_SalesRevenueGoodsNet | $ 266,279,000 us-gaap_SalesRevenueGoodsNet | $ 229,505,000 us-gaap_SalesRevenueGoodsNet
Cost of product sales | 116,999,000 us-gaap_CostOfGoodsSold | 106,292,000 us-gaap_CostOfGoodsSold | 236,425,000 us-gaap_CostOfGoodsSold | 203,239,000 us-gaap_CostOfGoodsSold
Gross profit | 15,666,000 us-gaap_GrossProfit | 13,734,000 us-gaap_GrossProfit | 29,854,000 us-gaap_GrossProfit | 26,266,000 us-gaap_GrossProfit
Operating costs and expenses: |  |  |  |
Research and development | 1,825,000 us-gaap_ResearchAndDevelopmentExpense | 1,919,000 us-gaap_ResearchAndDevelopmentExpense | 3,620,000 us-gaap_ResearchAndDevelopmentExpense | 3,845,000 us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative | 9,949,000 us-gaap_SellingGeneralAndAdministrativeExpense | 8,639,000 us-gaap_SellingGeneralAndAdministrativeExpense | 18,808,000 us-gaap_SellingGeneralAndAdministrativeExpense | 17,269,000 us-gaap_SellingGeneralAndAdministrativeExpense
Total operating costs and expenses | 11,774,000 us-gaap_OperatingExpenses | 10,558,000 us-gaap_OperatingExpenses | 22,428,000 us-gaap_OperatingExpenses | 21,114,000 us-gaap_OperatingExpenses
Operating income | 3,892,000 us-gaap_OperatingIncomeLoss | 3,176,000 us-gaap_OperatingIncomeLoss | 7,426,000 us-gaap_OperatingIncomeLoss | 5,152,000 us-gaap_OperatingIncomeLoss
Dividend income | 321,000 us-gaap_InvestmentIncomeDividend | 281,000 us-gaap_InvestmentIncomeDividend | 602,000 us-gaap_InvestmentIncomeDividend | 563,000 us-gaap_InvestmentIncomeDividend
Interest income | 91,000 us-gaap_InvestmentIncomeInterest | 46,000 us-gaap_InvestmentIncomeInterest | 184,000 us-gaap_InvestmentIncomeInterest | 105,000 us-gaap_InvestmentIncomeInterest
Interest expense | (472,000)us-gaap_InterestExpense | (436,000)us-gaap_InterestExpense | (855,000)us-gaap_InterestExpense | (867,000)us-gaap_InterestExpense
Other income | 1,200,000 us-gaap_OtherNonoperatingIncomeExpense | 2,300,000 us-gaap_OtherNonoperatingIncomeExpense | 1,400,000 us-gaap_OtherNonoperatingIncomeExpense | 7,700,000 us-gaap_OtherNonoperatingIncomeExpense
Net income before taxes | 5,032,000 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 5,367,000 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 8,757,000 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 12,653,000 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Income tax expense | (1,785,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | (1,874,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | (3,086,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax | (4,349,000)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax
Consolidated net income | 3,247,000 us-gaap_ProfitLoss | 3,493,000 us-gaap_ProfitLoss | 5,671,000 us-gaap_ProfitLoss | 8,304,000 us-gaap_ProfitLoss
Non-controlling interest | (24,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (42,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (95,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (101,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income and comprehensive income applicable to common stockholders | $ 3,223,000 us-gaap_ComprehensiveIncomeNetOfTax | $ 3,451,000 us-gaap_ComprehensiveIncomeNetOfTax | $ 5,576,000 us-gaap_ComprehensiveIncomeNetOfTax | $ 8,203,000 us-gaap_ComprehensiveIncomeNetOfTax
Basic net income per share (in dollars per share) | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.13 us-gaap_EarningsPerShareBasic | $ 0.21 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share) | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.13 us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted
Earnings Per Share [Abstract] |  |  |  |
Basic (in shares) | 26,864 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 26,571 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 26,852 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 26,512 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) | 27,314 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,070 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,293 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,081 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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