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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Statements of Assets and Liabilities [Abstract]    
Investment in gold at cost $ 1,041,018 $ 983,748
Common stock, shares authorized Unlimited Unlimited
Common stock, par value $ 0 $ 0
Common stock, shares issued 8,800,000 8,350,000
Common stock, shares outstanding 8,800,000 8,350,000
Net asset value per share $ 128.03 $ 125.51