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Subsequent Events (Detail Textuals) (Subsequent event, USD $)
1 Months Ended
Feb. 20, 2015
Feb. 23, 2015
Subsequent Event [Line Items]    
Received claim for insurance damages $ 4,500,000us-gaap_LossContingencyDamagesPaidValue  
Arbitration Award
   
Subsequent Event [Line Items]    
Final amount of arbitration award   $ 5,201,000us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_AwardTypeAxis
= svt_ArbitrationAwardMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Annual interest rate   9.00%svt_LossContingencyAnnualInterestRate
/ us-gaap_AwardTypeAxis
= svt_ArbitrationAwardMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember