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Litigation (Detail Textuals) (Pending Litigation, Aero Metal Products, Inc. (AMP), USD $)
12 Months Ended
Dec. 31, 2014
Pending Litigation | Aero Metal Products, Inc. (AMP)
 
Litigation [Line Items]  
Amount of alleged damages $ 3,000,000us-gaap_LossContingencyDamagesSoughtValue
/ dei_LegalEntityAxis
= svt_AeroMetalProductsIncMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
Amount of counter claim $ 3,191,000svt_CounterClaimAmount
/ dei_LegalEntityAxis
= svt_AeroMetalProductsIncMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember