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Preferred Stock Rights (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 21, 2011
Right
Preferred Stock Rights      
Common stock, par value (in dollars per share) 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare  
Preferred Stock Rights Agreement [Member]      
Preferred Stock Rights      
Date on which dividends payable was declared by Board of Directors Mar. 21, 2011    
Number of preferred stock purchase right declared for each outstanding common stock (per right)     1gvp_NumberOfPreferredStockPurchaseRightDeclaredForEachOutstandingCommonStock
/ us-gaap_ClassOfWarrantOrRightAxis
= gvp_PreferredStockRightsAgreementMember
Common stock, par value (in dollars per share)     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= gvp_PreferredStockRightsAgreementMember
Number of rights issued with each issuance of common stock (per right)     1gvp_NumberOfRightIssuedForEachNewCommonStockIssued
/ us-gaap_ClassOfWarrantOrRightAxis
= gvp_PreferredStockRightsAgreementMember
Term of stockholder protection rights agreement 3 years    
Rights Agreement Amendment Date Mar. 21, 2014    
Term of the Rights Agreement extension 2 years    
Rights Agreement Expiration Date Mar. 21, 2016    
Fraction of participating preferred stock that can be exercised as a result of right     0.01gvp_FractionShareAgainstEachParticipatingPreferredShareEntitleEachRight
/ us-gaap_ClassOfWarrantOrRightAxis
= gvp_PreferredStockRightsAgreementMember
Exercise price of right (in dollars per share)     $ 8.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= gvp_PreferredStockRightsAgreementMember
Minimum percentage of common stock owned for right to become exercisable (in hundredths)     20.00%gvp_PercentageOfCommonStockOwnedForRightToBecomeExercisableMinimum
/ us-gaap_ClassOfWarrantOrRightAxis
= gvp_PreferredStockRightsAgreementMember
Redemption price per right (in dollars per share)     $ 0.001gvp_RedemptionPricePerRight
/ us-gaap_ClassOfWarrantOrRightAxis
= gvp_PreferredStockRightsAgreementMember
Number of common stock exchange for rights (in shares)     1gvp_NumberOfCommonStockExchangeForRights
/ us-gaap_ClassOfWarrantOrRightAxis
= gvp_PreferredStockRightsAgreementMember
Percentage of common stock acquired to cause substantial dilution (in hundredths)     20.00%gvp_PercentageOfCommonStockAcquiredToCauseSubstantialDilution
/ us-gaap_ClassOfWarrantOrRightAxis
= gvp_PreferredStockRightsAgreementMember