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CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Statement [Abstract]    
Revenue $ 8,171us-gaap_SalesRevenueGoodsNet $ 6,990us-gaap_SalesRevenueGoodsNet
Costs, expenses and other income:    
Cost of goods sold, exclusive of depreciation and amortization 6,476us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization 5,438us-gaap_CostOfGoodsSoldExcludingDepreciationDepletionAndAmortization
Selling, general and administrative 1,765us-gaap_SellingGeneralAndAdministrativeExpense 1,576us-gaap_SellingGeneralAndAdministrativeExpense
Interest expense 21us-gaap_InterestExpense 9us-gaap_InterestExpense
Arbitration award expense 50svt_ArbitrationAwardExpense  
Depreciation and amortization 163us-gaap_DepreciationAndAmortization 169us-gaap_DepreciationAndAmortization
Insurance proceeds - arbitration (4,500)svt_InsuranceProceedsArbitration  
Other income, net (2)us-gaap_OtherNonoperatingIncome (1)us-gaap_OtherNonoperatingIncome
Total expenses 3,973svt_CostsExpensesAndOtherIncomeTotal 7,191svt_CostsExpensesAndOtherIncomeTotal
Income (loss) before income tax provision 4,198us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (201)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax provision 1,427us-gaap_IncomeTaxExpenseBenefit (56)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) $ 2,771us-gaap_NetIncomeLoss $ (145)us-gaap_NetIncomeLoss
Basic    
Net income (loss) per share (in dollars per share) $ 1.27us-gaap_EarningsPerShareBasic $ (0.07)us-gaap_EarningsPerShareBasic
Diluted    
Net income (loss) per share (in dollars per share) $ 1.23us-gaap_EarningsPerShareDiluted $ (0.06)us-gaap_EarningsPerShareDiluted