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Contingencies and Commitments - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
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Sep. 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 | $ 232

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