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Condensed Statements of Assets and Liabilities (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Investment in bullion at cost $ 159,154us-gaap_InvestmentOwnedAtCost $ 242,403us-gaap_InvestmentOwnedAtCost
Common stock, shares issued 2,450,000us-gaap_CommonStockSharesIssued 3,850,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 2,450,000us-gaap_CommonStockSharesOutstanding 3,850,000us-gaap_CommonStockSharesOutstanding
Net asset value per Share $ 61.10gltr_NetAssetValuePerShare $ 61.60gltr_NetAssetValuePerShare
Gold [Member]    
Investment in bullion at cost 87,541us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAU
133,156us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAU
Silver [Member]    
Investment in bullion at cost 48,190us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAG
73,612us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XAG
Platinum [Member]    
Investment in bullion at cost 12,564us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPT
19,160us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPT
Palladium [Member]    
Investment in bullion at cost $ 10,859us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPD
$ 16,475us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPD