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INVESTMENT MANAGEMENT, TRANSFER AGENT AND OTHER FEES - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 01, 2014 | Dec. 31, 2013 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2014
Investment Management And Other Fees [Line Items] |  |  |  |  |  |  |
Base percentage adjustment when fund performance is not within limits to benchmark index |  |  | 0.25%grow_InvestmentAdvisoryFeesFeeAdjustmentBasePercentageAdjustmentWhenFundPerformanceIsNotWithinLimitstoBenchmarkIndex |  | 0.25%grow_InvestmentAdvisoryFeesFeeAdjustmentBasePercentageAdjustmentWhenFundPerformanceIsNotWithinLimitstoBenchmarkIndex |  |
Percent minimum performance to designated benchmark over prior rolling 12 months |  |  | 5.00%grow_InvestmentAdvisoryFeesFeeAdjustmentPercentMinimumPerformancetoDesignedBenchmarkOverPriorRolling12Months |  | 5.00%grow_InvestmentAdvisoryFeesFeeAdjustmentPercentMinimumPerformancetoDesignedBenchmarkOverPriorRolling12Months |  |
Increase (decrease) in base advisory fees realized |  |  | $ (281,000)grow_IncreaseDecreaseInBaseAdvisoryFeesRealized | $ (214,000)grow_IncreaseDecreaseInBaseAdvisoryFeesRealized | $ (710,000)grow_IncreaseDecreaseInBaseAdvisoryFeesRealized | $ (632,000)grow_IncreaseDecreaseInBaseAdvisoryFeesRealized |
Aggregate fees waived and expenses borne |  |  | 391,000 grow_AggregateFeesWaivedAndExpensesBorne | 354,000 grow_AggregateFeesWaivedAndExpensesBorne | 1,005,000 grow_AggregateFeesWaivedAndExpensesBorne | 2,102,000 grow_AggregateFeesWaivedAndExpensesBorne |
Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield |  |  |  | 0 grow_FeesWaivedAndOrExpensesReimbursedtoMaintainMinimumYield |  | 584,000 grow_FeesWaivedAndOrExpensesReimbursedtoMaintainMinimumYield |
Administrative services fees per fund | 7,000 grow_RevenueFromAdministrativeServicesPerFund | 10,000 grow_RevenueFromAdministrativeServicesPerFund |  |  |  |  |
Receivables |  |  | 1,900,000 us-gaap_ReceivablesNetCurrent |  | 1,900,000 us-gaap_ReceivablesNetCurrent |  | 2,513,000 us-gaap_ReceivablesNetCurrent
Recorded advisory and performance fees |  |  | 1,248,000 us-gaap_InvestmentAdvisoryFees | 1,826,000 us-gaap_InvestmentAdvisoryFees | 5,359,000 us-gaap_InvestmentAdvisoryFees | 5,737,000 us-gaap_InvestmentAdvisoryFees |
Investor Class Shares |  |  |  |  |  |  |
Investment Management And Other Fees [Line Items] |  |  |  |  |  |  |
Previous administrative fee rate |  | 0.08%grow_AnnualAdministrativeFeeRatePrevious / us-gaap_CapitalUnitsByClassAxis = grow_InvestorClassSharesMember |  |  |  |  |
Current annual administrative fee rate |  | 0.10%grow_AnnualAdministrativeFeeRate / us-gaap_CapitalUnitsByClassAxis = grow_InvestorClassSharesMember |  |  |  |  |
Institutional Class Shares |  |  |  |  |  |  |
Investment Management And Other Fees [Line Items] |  |  |  |  |  |  |
Previous administrative fee rate |  | 0.06%grow_AnnualAdministrativeFeeRatePrevious / us-gaap_CapitalUnitsByClassAxis = grow_InstitutionalClassSharesMember |  |  |  |  |
Current annual administrative fee rate |  | 0.08%grow_AnnualAdministrativeFeeRate / us-gaap_CapitalUnitsByClassAxis = grow_InstitutionalClassSharesMember |  |  |  |  |
Offshore Funds |  |  |  |  |  |  |
Investment Management And Other Fees [Line Items] |  |  |  |  |  |  |
Recorded advisory and performance fees |  |  | 25,000 us-gaap_InvestmentAdvisoryFees / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundsMember | 42,000 us-gaap_InvestmentAdvisoryFees / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundsMember | 103,000 us-gaap_InvestmentAdvisoryFees / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundsMember | 147,000 us-gaap_InvestmentAdvisoryFees / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundsMember |
Offshore Funds | Investment Advisory Services |  |  |  |  |  |  |
Investment Management And Other Fees [Line Items] |  |  |  |  |  |  |
Number of offshore clients company provides advisory services for |  |  | 2 grow_NumberofCustomers / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundsMember / us-gaap_ProductOrServiceAxis = grow_InvestmentAdvisoryServicesMember |  | 2 grow_NumberofCustomers / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundsMember / us-gaap_ProductOrServiceAxis = grow_InvestmentAdvisoryServicesMember |  |
Government Fund |  |  |  |  |  |  |
Investment Management And Other Fees [Line Items] |  |  |  |  |  |  |
Minimum yield waivers recoverable through 12/31/15 |  |  |  |  | 510,000 grow_WaiversRecoverableInCurrentYear / grow_FundNameAxis = grow_GovernmentFundMember |  |
Minimum yield waivers recoverable through 12/31/16 |  |  |  |  | 498,000 grow_WaiversRecoverableInSecondYear / grow_FundNameAxis = grow_GovernmentFundMember |  |
Receivables | U.S. Global Investors Funds |  |  |  |  |  |  |
Investment Management And Other Fees [Line Items] |  |  |  |  |  |  |
Receivables |  |  | 502,000 us-gaap_ReceivablesNetCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsReceivableMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = grow_UnitedStatesGlobalInvestorsFundsMember |  | 502,000 us-gaap_ReceivablesNetCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsReceivableMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = grow_UnitedStatesGlobalInvestorsFundsMember |  |
Galileo Global Equity Advisor Inc |  |  |  |  |  |  |
Investment Management And Other Fees [Line Items] |  |  |  |  |  |  |
Recorded advisory and performance fees |  |  | $ 413,000 us-gaap_InvestmentAdvisoryFees / dei_LegalEntityAxis = grow_GalileoGlobalEquityAdvisorIncMember |  |  | $ 1,590,000 us-gaap_InvestmentAdvisoryFees / dei_LegalEntityAxis = grow_GalileoGlobalEquityAdvisorIncMember |

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