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Stock-Based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stock-Based Compensation [Abstract]    
Pre-tax share based compensation expense $ 134,000us-gaap_AllocatedShareBasedCompensationExpense $ 178,000us-gaap_AllocatedShareBasedCompensationExpense
Shares granted under stock options (in shares) 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Fair value of shares granted under stock option plan $ 40,000gvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue $ 56,000gvp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue