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Income Tax Provision - Deferred tax assets (liabilities) (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Inventories $ 493us-gaap_DeferredTaxAssetsInventory $ 333us-gaap_DeferredTaxAssetsInventory
Accrued employee compensation and benefit costs 508us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 458us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Accrued arbitration award and related liability 1,903svt_DeferredTaxAssetsTaxDeferredExpenseAccruedArbitrationAwardAndRelatedLiability  
Operating loss and credit carryforwards 287us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 297us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 45us-gaap_DeferredTaxAssetsOther 64us-gaap_DeferredTaxAssetsOther
Minimum pension liability 7us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 14us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Total deferred tax assets 3,243us-gaap_DeferredTaxAssetsGross 1,166us-gaap_DeferredTaxAssetsGross
Valuation allowance (295)us-gaap_DeferredTaxAssetsValuationAllowance (279)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset 2,948us-gaap_DeferredTaxAssetsNet 887us-gaap_DeferredTaxAssetsNet
Property, plant and equipment (691)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (622)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities (691)us-gaap_DeferredIncomeTaxLiabilities (622)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset $ 2,257us-gaap_DeferredTaxAssetsLiabilitiesNet $ 265us-gaap_DeferredTaxAssetsLiabilitiesNet