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Consolidated Statements Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2014 | May 31, 2013 | May 31, 2012
Statement of Comprehensive Income [Abstract] |  |  |
Net income (loss) | $ 2,666 us-gaap_NetIncomeLoss | $ (1,211)us-gaap_NetIncomeLoss | $ (5,183)us-gaap_NetIncomeLoss
Other comprehensive (loss) income, before tax: |  |  |
Unrealized gain (loss) on marketable securities | (16)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | 184 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (103)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Unrealized gain (loss) on interest rate swap | (32)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | (522)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax | 327 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Foreign currency translation gain (loss) | 295 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax | (47)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax | (142)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Other comprehensive income (loss), before tax | 247 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | (385)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent | 82 us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Income tax benefit (expense) related to items of other comprehensive income | 18 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | 125 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 | (83)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other comprehensive income (loss), net of tax | 265 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (260)us-gaap_OtherComprehensiveIncomeLossNetOfTax | (1)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income (loss), net of tax | $ 2,931 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | $ (1,471)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | $ (5,184)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

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