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Income Taxes (Details Textual) (USD $)
 12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
May 31, 2011
Income Taxes (Textual) [Abstract]        
Remaining federal net operating loss $ 26,100,000ango_FederalNetOperatingLossExpectedToExpireBeforeUtilization      
State net operating loss expire prior to utilization 13,000,000ango_StateNetOperatingLossExpectedToExpireBeforeUtilization      
Taxable income per year for the next ten years 10,000,000ango_ExpectedProfitPerYearInNextTenYearsToReverseDeferredTaxAssets      
Taxable income per year for the final eight years 6,500,000ango_ExpectedProfitPerYearInFinalEightYearsToReverseDeferredTaxAssets      
Federal net operating loss carryforwards after considering IRC Section 382 limitations 139,800,000ango_FederalNetOperatingLossCarryforwardAfterConsideringLimitations      
Federal net operating loss first amount expiring 30,700,000ango_FederalNetOperatingLossExpectedExpirationAmountOne      
Maturity period of federal net operating loss carryforwards first amount minimum 2017      
Maturity period of federal net operating loss carryforwards first amount maximum 2026      
Federal Net Operating Loss Expected Expiration Amount Two 109,100,000ango_FederalNetOperatingLossExpectedExpirationAmountTwo      
Maturity period of federal net operating loss carryforwards second amount minimum 2027      
Maturity period of federal net operating loss carryforwards second amount maximum 2033      
State net operating loss carryforwards after considering remaining IRC Section 382 limitations 20,900,000ango_StateNetOperatingLossCarryforwardAfterConsideringLimitations      
Maturity period of state net operating loss carryforwards minimum 2015      
Net deferred income tax asset 13,900,000us-gaap_DeferredTaxAssetsNet      
Valuation Allowance (1,532,000)us-gaap_DeferredTaxAssetsValuationAllowance (712,000)us-gaap_DeferredTaxAssetsValuationAllowance    
Increase decrease valuation allowance 800,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 500,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount    
Effective income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations      
Tax liability not recognized 0ango_LiabilityForUncertainTaxPositions      
Unrecognized tax benefits 0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit      
Accrued interest and penalties recognized 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Correct state tax credit benefit       300,000ango_BenefitOfCorrectCertainStateTaxCredits
State tax credit claim     200,000ango_ClaimOfStateTaxCredits  
Beginning of open tax year range 2011      
End of open tax year range 2014      
State [Member]        
Income Tax [Line Items]        
Federal and State net operating loss carryforwards 33,800,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Federal [Member]        
Income Tax [Line Items]        
Federal and State net operating loss carryforwards 166,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
Operating loss carryforwards from acquired companies $ 161,500,000ango_OperatingLossCarryforwardsGeneratedbyAcquiredCompanies
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember