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Consolidated Balance Sheets [Parenthetical] (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts $ 171us-gaap_AllowanceForDoubtfulAccountsReceivable $ 172us-gaap_AllowanceForDoubtfulAccountsReceivable
Preferred stock, par value (in dollars per share) $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value (in dollars per share) $ 0.10us-gaap_CommonStockParOrStatedValuePerShare $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 25,000,000us-gaap_CommonStockSharesAuthorized 25,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding 12,729,837us-gaap_CommonStockSharesOutstanding 12,711,692us-gaap_CommonStockSharesOutstanding
Treasury Stock, shares 2,000us-gaap_TreasuryStockShares 0us-gaap_TreasuryStockShares
Class B Convertible Common Stock    
Common stock, par value (in dollars per share) $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= vpg_ClassBConvertibleCommonStockMember
$ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= vpg_ClassBConvertibleCommonStockMember
Common stock, shares authorized 3,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= vpg_ClassBConvertibleCommonStockMember
3,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= vpg_ClassBConvertibleCommonStockMember
Common stock, shares outstanding 1,025,176us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= vpg_ClassBConvertibleCommonStockMember
1,025,176us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= vpg_ClassBConvertibleCommonStockMember