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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Investment in Bullion at cost $ 321,781 $ 276,167
Common stock, shares authorized Unlimited Unlimited
Common stock, par value $ 0 $ 0
Common stock, shares issued 5,250,000 4,500,000
Common stock, shares outstanding 5,250,000 4,500,000
Net asset values per Share $ 61.59 $ 58.11
Gold [Member]    
Investment in Bullion at cost $ 182,567 $ 156,455
Silver [Member]    
Investment in Bullion at cost 96,421 82,947
Platinum [Member]    
Investment in Bullion at cost 21,970 19,292
Palladium [Member]    
Investment in Bullion at cost $ 20,823 $ 17,473