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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income (Loss) from Continuing Operations [Abstract]    
Domestic $ (4,608,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (7,797,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign (1,968,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (2,568,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Loss before income taxes (6,576,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (10,365,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current: [Abstract]    
Federal 0us-gaap_CurrentFederalTaxExpenseBenefit 4,000us-gaap_CurrentFederalTaxExpenseBenefit
State 10,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 22,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign 178,000us-gaap_CurrentForeignTaxExpenseBenefit 382,000us-gaap_CurrentForeignTaxExpenseBenefit
Subtotal 188,000us-gaap_CurrentIncomeTaxExpenseBenefit 408,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred [Abstract]    
Federal 24,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign (46,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (262,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Subtotal (22,000)us-gaap_DeferredIncomeTaxExpenseBenefit (262,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Total 166,000us-gaap_IncomeTaxExpenseBenefit 146,000us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Statutory federal income tax rate (in hundredths) 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal tax benefit (in hundredths) (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effect of foreign operations (in hundredths) (10.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (6.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Tax benefit resulting from OCI allocation 0.00%gvp_TaxBenefitResultingFromOciAllocation 0.50%gvp_TaxBenefitResultingFromOciAllocation
Change in valuation allowance (in hundredths) (22.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (12.10%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other, principally permanent differences (in hundredths) (3.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (16.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate (in hundredths) (2.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (1.40%)us-gaap_EffectiveIncomeTaxRateContinuingOperations
Non-cash income tax adjustment   (49,000)us-gaap_OtherComprehensiveIncomeLossTax
Deferred Tax Assets, Net [Abstract]    
Net operating loss carryforwards 7,745,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 5,589,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capital loss carryforwards 615,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 703,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Accruals 485,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 337,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Reserves 521,000gvp_ExpensesNotCurrentlyDeductibleForTaxPurposes 611,000gvp_ExpensesNotCurrentlyDeductibleForTaxPurposes
Alternative minimum tax credit carryforwards 166,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 166,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Other 1,484,000us-gaap_DeferredTaxAssetsOther 1,701,000us-gaap_DeferredTaxAssetsOther
Total deferred tax asset 11,016,000us-gaap_DeferredTaxAssetsGross 9,107,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (10,006,000)us-gaap_DeferredTaxAssetsValuationAllowance (7,057,000)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets less valuation allowance 1,010,000us-gaap_DeferredTaxAssetsNet 2,050,000us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities: [Abstract]    
Undistributed earnings of foreign subsidiaries (102,000)us-gaap_UndistributedEarningsOfForeignSubsidiaries (1,228,000)us-gaap_UndistributedEarningsOfForeignSubsidiaries
Software development costs (542,000)gvp_SoftwareDevelopmentCosts (384,000)gvp_SoftwareDevelopmentCosts
Other (397,000)us-gaap_DeferredTaxLiabilitiesOther (491,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (1,041,000)us-gaap_DeferredIncomeTaxLiabilities (2,103,000)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset (liability) (31,000)us-gaap_DeferredTaxLiabilities (53,000)us-gaap_DeferredTaxLiabilities
Change in valuation allowance 2,949,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 31,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Deferred Tax Liabilities, Goodwill 24,000us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill  
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 6,800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic  
Operating loss carryforwards 19,100,000us-gaap_OperatingLossCarryforwards  
Operating Loss Carryforwards, expiration dates [Line Items]    
Valuation allowance 10,006,000us-gaap_DeferredTaxAssetsValuationAllowance 7,057,000us-gaap_DeferredTaxAssetsValuationAllowance
Unrecognized tax benefits from stock option exercises 5,400,000gvp_UnrecognizedTaxBenefitsFromStockOptionExercises  
Income Tax Contingency [Line Items]    
Income tax penalties and interest expense on tax liabilities for certain foreign tax contingencies 2,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 2,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Foreign Tax Authority [Member]    
Income Tax Contingency [Line Items]    
Tax liabilities for certain foreign tax contingencies 20,000us-gaap_UnrecognizedTaxBenefits
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 187,000us-gaap_UnrecognizedTaxBenefits
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
Payments made for tax liabilities for certain foreign tax contingencies $ 211,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 $ 103,000us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
Maximum [Member]    
Operating Loss Carryforwards, expiration dates [Line Items]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2034  
Minimum [Member]    
Operating Loss Carryforwards, expiration dates [Line Items]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2020