Financial Highlights (Details) - $ / shares		3 Months Ended
		Apr. 30, 2018	Apr. 30, 2017
Financial Highlights [Abstract]
Net asset value per share, beginning of period		$ 13.25	$ 12.00
Net investment loss	[1]	(0.01)	(0.01)
Net realized and unrealized gain (loss) on investment in gold bullion		(0.31)	0.53
Net change in net assets from operations		(0.32)	0.52
Net asset value per share, end of period		$ 12.93	$ 12.52
Total return, at net asset value	[2]	(2.42%)	4.33%
Ratio to average net assets
Net investment loss	[3]	(0.40%)	(0.40%)
Net expenses	[3]	0.40%	0.40%

[1] Calculated using average shares outstanding

[2] Not Annualized

[3] Annualized