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Contingencies and Commitments - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2013
Commitments And Contingencies Disclosure [Abstract]
Monthly dividend declared	$ 0.005
Amount of cash dividends to be paid to class A and class C shareholders	$ 465

X

- Definition

Dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ References

No definition available.

+ Details

Name:	grow_DeclaredDividends
Namespace Prefix:	grow_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Monthly declared dividend per share.

+ References

No definition available.

+ Details

Name:	grow_MonthlyDeclaredDividend
Namespace Prefix:	grow_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration