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Shareholders' Equity (Detail Textuals) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]    
Purchase of treasury shares (in dollars) $ 202us-gaap_TreasuryStockValueAcquiredCostMethod $ 607us-gaap_TreasuryStockValueAcquiredCostMethod
Share Repurchase Program    
Equity, Class of Treasury Stock [Line Items]    
Number of common shares authorized to be purchased (in shares) 450,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_ShareRepurchaseProgramAxis
= svt_ShareRepurchaseProgramMember
 
Treasury stock, shares (in shares) 8,687us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= svt_ShareRepurchaseProgramMember
71,458us-gaap_TreasuryStockSharesAcquired
/ us-gaap_ShareRepurchaseProgramAxis
= svt_ShareRepurchaseProgramMember
Purchase of treasury shares (in dollars) $ 62us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= svt_ShareRepurchaseProgramMember
$ 607us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_ShareRepurchaseProgramAxis
= svt_ShareRepurchaseProgramMember
Shares purchased during period (in shares) 331,970us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_ShareRepurchaseProgramAxis
= svt_ShareRepurchaseProgramMember
 
Remaining number of shares authorized to be purchased (in shares) 118,030us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_ShareRepurchaseProgramAxis
= svt_ShareRepurchaseProgramMember