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Shareholders' Equity (Detail Textuals 3) (USD $)
12 Months Ended
Dec. 31, 2014
Employee Stock Option Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share Price $ 6.49us-gaap_SharePrice
/ us-gaap_PlanNameAxis
= svt_EmployeeStockOptionPlanMember
Rights Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of beneficial ownership 25% or more
Number of business days 10 days
Exercise price $ 32.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= svt_RightsPlanMember
Right entitle to purchase, description Each right would entitle the holder to purchase one one-hundredth of a share of Series A Junior Participating Preferred Stock.
Shareholders rights plan, description Exchange two shares of common stock or two one-hundredths of a share of preferred stock for each right