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Acquisitions (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 14, 2014
Business Acquisition [Line Items]        
Payments to Acquire Equity Method Investments $ 250,000us-gaap_PaymentsToAcquireEquityMethodInvestments $ 0us-gaap_PaymentsToAcquireEquityMethodInvestments    
Business Acquisition, Period Results Included in Combined Entity 0 years 1 month 15 days      
Business Combinations Purchase Price Allocation [Abstract]        
Goodwill 5,612,000us-gaap_Goodwill 0us-gaap_Goodwill 4,502,000us-gaap_Goodwill  
Business Acquisition, Pro Forma Information [Abstract]        
Revenue 53,611,000us-gaap_BusinessAcquisitionsProFormaRevenue 66,587,000us-gaap_BusinessAcquisitionsProFormaRevenue    
Operating income (loss) (6,149,000)us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax (10,534,000)us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax    
Net income (loss) (5,977,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss (1,711,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss    
Earnings (loss) per common share - basic $ (0.33)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic $ (0.57)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic    
Earnings (loss) per common share - diluted $ (0.33)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted $ (0.57)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted    
Business Acquisition, Period Results Included in Combined Entity 0 years 1 month 15 days      
Hyperspring, LLC [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Name of Acquired Entity Hyperspring, LLC      
Business Acquisition, Effective Date of Acquisition Nov. 14, 2014      
Percentage of ownership interest acquired (in hundredths)       100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       11,400,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
Cash purchase price 3,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Fair value of contingent consideration 3,953,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Business Combination, Consideration Transferred, Total 6,953,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Business Combinations Purchase Price Allocation [Abstract]        
Cash 152,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Contract receivables 1,719,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Prepaid expenses and other current assets 23,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Property, plant and equipment, net 12,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Intangible assets 779,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
    779,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
Goodwill 5,612,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Total assets 8,297,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Line of credit 749,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Accounts payable, accrued expenses and other liabilities 586,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Billings in excess of revenue earned 9,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Total liabilities 1,344,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Net assets acquired 6,953,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
     
Hyperspring, LLC [Member] | Contingent Consideration Case 1 [Member]        
Business Acquisition [Line Items]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       7,200,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
/ gvp_ContingentConsiderationByType1Axis
= gvp_ContingentConsiderationCase1Member
Hyperspring, LLC [Member] | Contingent Consideration Case 1 [Member] | EBITDA Target [Member]        
Business Acquisition [Line Items]        
Business Combination, Contingent Consideration Arrangements, Description certain EBITDA (earnings before interest, taxes, depreciation and amortization) targets      
Business Acquisition Contingent Consideration Agreement for the three-year period ending November 13, 2017      
Hyperspring, LLC [Member] | Contingent Consideration Case 1 [Member] | Tennessee Valley Authority Renewal Target [Member]        
Business Acquisition [Line Items]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       1,200,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
/ gvp_ContingentConsiderationByType1Axis
= gvp_ContingentConsiderationCase1Member
/ us-gaap_ContingentConsiderationByTypeAxis
= gvp_TennesseeValleyAuthorityRenewalTargetMember
Business Combination, Contingent Consideration Arrangements, Description If Hyperspring is successful in renewing the TVA contract for substantially the same scope as currently being provided and at a profit margin that is greater than 15% on or before May 15, 2015,      
Hyperspring, LLC [Member] | Contingent Consideration Case 2 [Member] | EBITDA Target [Member]        
Business Acquisition [Line Items]        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       8,400,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
/ gvp_ContingentConsiderationByType1Axis
= gvp_ContingentConsiderationCase2Member
/ us-gaap_ContingentConsiderationByTypeAxis
= gvp_EBITDATargetMember
Business Combination, Contingent Consideration Arrangements, Description certain EBITDA (earnings before interest, taxes, depreciation and amortization) targets      
Business Acquisition Contingent Consideration Agreement for the three-year period ending November 13, 2017      
Hyperspring, LLC [Member] | Contractual Customer Relationships [Member]        
Business Combinations Purchase Price Allocation [Abstract]        
Intangible assets       779,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= gvp_HyperspringLlcMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
Hyperspring, LLC [Member] | Contractual Customer Relationships [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years      
IntelliQlik, LLC [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Name of Acquired Entity IntelliQlik, LLC      
Business Acquisition, Effective Date of Acquisition Nov. 14, 2014      
Percentage of ownership interest acquired (in hundredths)       50.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= gvp_IntelliqlikLlcMember
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High       250,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= gvp_IntelliqlikLlcMember
Payments to Acquire Equity Method Investments $ 250,000us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_BusinessAcquisitionAxis
= gvp_IntelliqlikLlcMember