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Shareholders' Equity (Detail Textuals 1) (2012 Long-Term Incentive Plan, USD $)
1 Months Ended 3 Months Ended
Jan. 31, 2015
Apr. 18, 2013
Mar. 31, 2015
Mar. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of restricted stock shares vested 41,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod      
Number of shares withheld and repurchased 17,435us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation      
Value of shares withheld and repurchased $ 114,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation      
Restricted stock | Executive Officers
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of restricted stock issued   165,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Number of shares authorized for issuance   300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Vesting period of restricted share awards   4 years    
Compensation expense not yet recognized   1,336,500us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Compensation expenses, recognition period   4 years    
Expense recognized for issuance of restricted shares     $ 90,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
$ 90,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember