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Financial Highlights - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Per Share Performance (for a Share outstanding throughout the entire period)      
Net asset value per Share at beginning of period $ 125.51 $ 112.65 $ 103.64
Income from investment operations:      
Net investment loss (0.46) (0.48) (0.48)
Total realized and unrealized gains or losses on investment in gold (1.44) 13.34 9.49
Change in net assets from operations (1.90) 12.86 9.01
Net asset value per Share at end of period $ 123.61 $ 125.51 $ 112.65
Weighted average number of Shares 7,719,863 8,386,986 8,250,683
Expense ratio 0.38% [1] 0.39% 0.39%
Net investment loss ratio (0.38%) (0.39%) (0.39%)
Total return, at net asset value (1.51%) 11.42% 8.69%
[1] Effective December 1, 2018, the Sponsor's Fee accrues daily at an annualized rate of 0.17%. Prior to December 1, 2018, the Sponsor's Fee accrued at a daily annualized rate of 0.39%.