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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) $ 2,666us-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 184us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax (103)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Unrealized gain (loss) on interest rate swap (32)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax (522)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax 327us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Foreign currency translation gain (loss) 295us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (47)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (142)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax
Other comprehensive income (loss), before tax 247us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent (385)us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent 82us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent
Income tax benefit (expense) related to items of other comprehensive income 18us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 125us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 (83)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1
Other comprehensive income (loss), net of tax 265us-gaap_OtherComprehensiveIncomeLossNetOfTax (260)us-gaap_OtherComprehensiveIncomeLossNetOfTax (1)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income (loss), net of tax $ 2,931us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent $ (1,471)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent $ (5,184)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent