Note 2 - Significant Accounting Policies (Details Textual)	Mar. 31, 2018 shares
Shares Prescribed Aggregation	50,000

Prescribed aggregation at which shares are issued and redeemed.

No definition available.

Name:	iau_SharesPrescribedAggregation
Namespace Prefix:	iau_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant