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Shareholders' Equity (Detail Textuals 1) (Restricted stock, USD $)
12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
Jan. 02, 2014
Apr. 18, 2013
Dec. 31, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Compensation expense not yet recognized $ 720,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions      
Compensation expenses, recognition period 2 years 3 months 18 days      
Number of restricted stock shares vested 41,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod      
2012 Long-Term Incentive Plan        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Number of restricted stock shares vested   41,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
   
Number of shares withheld and repurchased and added to treasury   17,345us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
   
Value of shares withheld and repurchased and added to treasury   140,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
   
2012 Long-Term Incentive Plan | 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_RelatedPartyTransactionsByRelatedPartyAxis
= 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_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
 
Vesting period of restricted share awards     4 years  
Expense recognized for issuance of restricted shares 361,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
    255,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
Compensation expense not yet recognized     $ 1,336,500us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= svt_LongTermIncentivePlan2012Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ExecutiveOfficerMember
 
Compensation expenses, recognition period     4 years