Schedules of Investment (Details)		Apr. 30, 2018 USD ($) Ounces	Jan. 31, 2018 USD ($) Ounces
Schedule of Investments [Line Items]
Cost		$ 138,324,120	$ 131,137,185
Gold bullion [Member]
Schedule of Investments [Line Items]
Fine Ounces | Ounces		111,113	105,697
Cost		$ 138,324,120	$ 131,137,185
Value		$ 145,914,344	$ 142,168,257
% of Net Assets		100.00%	100.00%
Total investments [Member]
Schedule of Investments [Line Items]
Cost		$ 138,324,120	$ 131,137,185
Value		$ 145,914,344	$ 142,168,257
% of Net Assets		100.00%	100.00%
Liabilities in excess of other assets [Member]
Schedule of Investments [Line Items]
Value		$ (12)	$ (12)
% of Net Assets	[1]	0.00%	0.00%
Net Assets [Member]
Schedule of Investments [Line Items]
Value		$ 145,914,332	$ 142,168,245
% of Net Assets		100.00%	100.00%

[1] Amount is less than 0.005%