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Income Taxes (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Allowance for doubtful accounts $ 704us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 508us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Accrued liabilities and other 1,882us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 1,787us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Stock-based compensation expense 391gpx_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsStockBasedCompensationExpense 629gpx_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsStockBasedCompensationExpense
Net federal, state and foreign operating loss carryforwards 1,375us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 922us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred tax assets 4,352us-gaap_DeferredTaxAssetsLiabilitiesNet 3,846us-gaap_DeferredTaxAssetsLiabilitiesNet
Valuation allowance on deferred tax assets (1,247)us-gaap_DeferredTaxAssetsValuationAllowance (584)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax liabilities:    
Intangible assets, property and equipment, principally due to difference in depreciation and amortization 7,939us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 7,677us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Net deferred tax liabilities $ (4,834)us-gaap_DeferredIncomeTaxLiabilities $ (4,415)us-gaap_DeferredIncomeTaxLiabilities