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INVESTMENTS - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of investments held | $ 20,700,000 grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure |  |  | $ 20,700,000 grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure |  |  |  |  |
Cost basis of investments held | 22,000,000 grow_TradingAndAvailableForSaleSecuritiesAmortizedCost |  |  | 22,000,000 grow_TradingAndAvailableForSaleSecuritiesAmortizedCost |  |  |  |  |
Other investments | 2,413,000 us-gaap_OtherLongTermInvestments |  |  | 2,413,000 us-gaap_OtherLongTermInvestments |  |  | 1,413,000 us-gaap_OtherLongTermInvestments |  |
Carrying value of investments to Company's total assets | 70.10%grow_ValueofInvestmentstoCompanyAssets |  |  | 70.10%grow_ValueofInvestmentstoCompanyAssets |  |  |  |  |
Trading securities, at fair value | 16,443,000 us-gaap_TradingSecurities | [1] |  | 16,443,000 us-gaap_TradingSecurities | [1] |  | 17,817,000 us-gaap_TradingSecurities | [1] |
Other than temporary declines in securities | 105,000 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities |  | 3,000 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities | 105,000 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities |  | 3,000 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities |  |  |
Amortized cost basis, subject to impairment loss | 4,750,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost | [2] |  | 4,750,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost | [2] |  | 4,851,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost | [2] |
Offshore fund |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of investments held | 465,000 grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundMember |  |  | 465,000 grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundMember |  |  |  |  |
Trading securities, at fair value | 465,000 us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundMember | [1] |  | 465,000 us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundMember | [1] |  | 998,000 us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundMember | [1] |
Corporate debt security, one |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Number of securities, subject to impairment loss | 1 grow_AvailableForSaleSecuritiesSubjectToImpairmentLossQualitativeDisclosureNumberOfPositions / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesOneMember |  |  | 1 grow_AvailableForSaleSecuritiesSubjectToImpairmentLossQualitativeDisclosureNumberOfPositions / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesOneMember |  |  |  |  |
Amortized cost basis, subject to impairment loss | 44,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesOneMember |  |  | 44,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesOneMember |  |  |  |  |
Available-for-sale securities, fair value, subject to impairment loss | 15,000 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesOneMember |  |  | 15,000 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesOneMember |  |  |  |  |
Corporate debt security, two |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Amortized cost basis, subject to impairment loss | 310,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesTwoMember |  |  | 310,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesTwoMember |  |  |  |  |
Available-for-sale securities, fair value, subject to impairment loss | 234,000 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesTwoMember |  |  | 234,000 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_CorporateDebtSecuritiesTwoMember |  |  |  |  |
Government Fund | Mutual funds |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Trading securities, at fair value |  |  |  |  |  |  |  |  | 14,100,000 us-gaap_TradingSecurities / grow_FundNameAxis = grow_GovernmentFundMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_MutualFundsMember
U.S. Global Investors Funds |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of investments held | $ 17,500,000 grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = grow_UnitedStatesGlobalInvestorsFundsMember |  |  | $ 17,500,000 grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = grow_UnitedStatesGlobalInvestorsFundsMember |  |  |  |  |
[1] | Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.
[2] | Net unrealized gains (losses) on available-for-sale securities gross and net of tax as of March 31, 2015, are $(447) and $(295), respectively, and as of June 30, 2014, are $1,345 and $888, respectively.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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