DIVIDEND - Additional Information (Detail) (USD $)	Sep. 30, 2012
Disclosure Of Dividends [Line Items]
Cash dividend paid monthly (per share)	$ 0.02

Subsequent Event Dividends Payable Amount Per Share

No definition available.

Name:	grow_SubsequentEventDividendsPayableAmountPerShare
Namespace Prefix:	grow_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant