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INVESTMENT MANAGEMENT, TRANSFER AGENT AND OTHER FEES - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended
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Nov. 01, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
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 |  |  | $ (247,000)grow_IncreaseDecreaseInBaseAdvisoryFeesRealized | $ (286,000)grow_IncreaseDecreaseInBaseAdvisoryFeesRealized | $ (430,000)grow_IncreaseDecreaseInBaseAdvisoryFeesRealized | $ (419,000)grow_IncreaseDecreaseInBaseAdvisoryFeesRealized
Aggregate fees waived and expenses borne |  |  | 337,000 grow_AggregateFeesWaivedAndExpensesBorne | 893,000 grow_AggregateFeesWaivedAndExpensesBorne | 614,000 grow_AggregateFeesWaivedAndExpensesBorne | 1,748,000 grow_AggregateFeesWaivedAndExpensesBorne
Fees waived and or expenses reimbursed U.S. Treasury Securities Cash Fund to maintain minimum yield |  |  |  | 249,000 grow_FeesWaivedAndOrExpensesReimbursedtoMaintainMinimumYield |  | 584,000 grow_FeesWaivedAndOrExpensesReimbursedtoMaintainMinimumYield
Administrative services fees per fund | 7,000 grow_RevenueFromAdministrativeServicesPerFund | 10,000 grow_RevenueFromAdministrativeServicesPerFund |  |  |  |
Recorded advisory and performance fees |  |  | 1,691,000 us-gaap_InvestmentAdvisoryFees | 1,822,000 us-gaap_InvestmentAdvisoryFees | 4,110,000 us-gaap_InvestmentAdvisoryFees | 3,911,000 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 |  |  | 32,000 us-gaap_InvestmentAdvisoryFees / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundsMember | 53,000 us-gaap_InvestmentAdvisoryFees / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundsMember | 79,000 us-gaap_InvestmentAdvisoryFees / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundsMember | 105,000 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 |

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- Definition Investment Advisory Fees, Fee Adjustment, Base Percentage Adjustment When Fund Performance Is Not Within Limits to Benchmark Index + References No definition available. + Details
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- Definition Investment Advisory Fees, Fee Adjustment, Percent Minimum Performance to Designed Benchmark Over Prior Rolling 12 Months + References No definition available. + Details
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- Definition Amount of fees earned from providing investment advice and research to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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