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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows related to operating activities:    
Net income (loss) $ 2,771us-gaap_NetIncomeLoss $ (145)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation and amortization 163us-gaap_DepreciationAndAmortization 169us-gaap_DepreciationAndAmortization
Deferred income tax 1,752us-gaap_DeferredIncomeTaxExpenseBenefit  
Stock based compensation 90us-gaap_ShareBasedCompensation 90us-gaap_ShareBasedCompensation
Increase in inventory reserve 51svt_IncreaseDecreaseInInventoryReserve 41svt_IncreaseDecreaseInInventoryReserve
Decrease in allowance for doubtful accounts (3)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease (10)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Change in assets and liabilities:    
Accounts receivable (440)us-gaap_IncreaseDecreaseInAccountsReceivable (188)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (116)us-gaap_IncreaseDecreaseInInventories (616)us-gaap_IncreaseDecreaseInInventories
Prepaid income taxes (337)us-gaap_IncreaseDecreaseInPrepaidTaxes (23)us-gaap_IncreaseDecreaseInPrepaidTaxes
Other assets (100)us-gaap_IncreaseDecreaseInOtherOperatingAssets (247)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Other non-current assets (5)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets (5)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Accounts payable 697us-gaap_IncreaseDecreaseInAccountsPayable 246us-gaap_IncreaseDecreaseInAccountsPayable
Accrued employee compensation and benefit costs 235us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities 38us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Accrued arbitration award and related liability (5,152)svt_IncreaseDecreaseInAccruedArbitrationAwardAndRelatedLiability  
Other accrued liabilities 67us-gaap_IncreaseDecreaseInOtherAccruedLiabilities 354us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Accrued income taxes (33)us-gaap_IncreaseDecreaseInAccruedTaxesPayable  
Net cash used in operating activities (360)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (296)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows related to investing activities:    
Capital expenditures - property, plant and equipment (281)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (418)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (281)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (418)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows related to financing activities:    
Principal payments on long-term debt (159)us-gaap_RepaymentsOfLongTermDebt (5)us-gaap_RepaymentsOfLongTermDebt
Purchase of treasury shares (114)us-gaap_PaymentsForRepurchaseOfCommonStock (156)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities (273)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (161)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net decrease in cash and cash equivalents (914)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (875)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 4,166us-gaap_CashAndCashEquivalentsAtCarryingValue 4,502us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 3,252us-gaap_CashAndCashEquivalentsAtCarryingValue [1] $ 3,627us-gaap_CashAndCashEquivalentsAtCarryingValue
[1] Unaudited