Statements of Changes in Net Assets - USD ($)	3 Months Ended	12 Months Ended
	Apr. 30, 2018	Jan. 31, 2018
Statements of Changes in Net Assets [Abstract]
Net assets, beginning of period	$ 142,168,245	$ 123,449,684
Creations	7,327,306	7,449,999
Redemptions		(1,915,670)
Net investment loss	(140,371)	(525,570)
Net realized gain from gold bullion distributed for redemptions		29,173
Net change in unrealized appreciation (depreciation) on investment in gold bullion	(3,440,848)	13,680,629
Net assets, end of period	$ 145,914,332	$ 142,168,245