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Subsequent Events - Additional Information (Detail) (USD $) | 1 Months Ended
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Aug. 23, 2013
Subsequent Event [Line Items] |
Administrative services fees on average daily net assets | $ 10,000
Minimum [Member] | Investor Class Shares [Member] |
Subsequent Event [Line Items] |
Board of trustees approved an increase to the administrative services fees paid to the Company | 0.08%
Minimum [Member] | Institutional Class Shares [Member] |
Subsequent Event [Line Items] |
Board of trustees approved an increase to the administrative services fees paid to the Company | 0.06%
Maximum [Member] | Investor Class Shares [Member] |
Subsequent Event [Line Items] |
Board of trustees approved an increase to the administrative services fees paid to the Company | 0.10%
Maximum [Member] | Institutional Class Shares [Member] |
Subsequent Event [Line Items] |
Board of trustees approved an increase to the administrative services fees paid to the Company | 0.08%

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- Definition Annual Administrative Fee Rate + References No definition available. + Details
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Namespace Prefix: | grow_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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

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