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Subsequent Events - Additional Information (Detail) (USD $) | 1 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2013 | Nov. 01, 2014 Forecast | Oct. 31, 2014 Forecast
Subsequent Event [Line Items] |  |  |
Administrative services fees per fund | $ 10,000 | $ 7,000 | $ 10,000

X
- Definition Revenue from Administrative Services per Fund + References No definition available. + Details
Name: | grow_RevenueFromAdministrativeServicesPerFund
Namespace Prefix: | grow_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration