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FAIR VALUE DISCLOSURES - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jun. 30, 2014
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Transfer from Level 1 to Level 2, amount | $ 82 us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount |  |  |  |
Transfer into Level 3 | 343 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 |  |  |  |
Trading, fair value | 16,443 us-gaap_TradingSecurities | [1] |  | 17,817 us-gaap_TradingSecurities | [1]
Quoted Prices (Level 1) |  |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Percentage of financial assets derived from Level 1 inputs measured at fair value | 94.00%grow_PercentageOfFinancialAssetsDerivedFromLevelOneInputsMeasuredAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |  | 90.00%grow_PercentageOfFinancialAssetsDerivedFromLevelOneInputsMeasuredAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Significant Other Inputs (Level 2) |  |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Percentage of financial assets derived from Level 2 inputs measured at fair value | 3.00%grow_PercentageOfFinancialAssetsDerivedFromLevelTwoInputsMeasuredAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |  | 9.00%grow_PercentageOfFinancialAssetsDerivedFromLevelTwoInputsMeasuredAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Significant Unobservable Inputs (Level 3) |  |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Percentage of financial assets derived from Level 3 inputs measured at fair value | 3.00%grow_PercentageOfFinancialAssetsDerivedFromLevelThreeInputsMeasuredAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  | 1.00%grow_PercentageOfFinancialAssetsDerivedFromLevelThreeInputsMeasuredAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Offshore fund |  |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Trading, fair value | 465 us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundMember | [1] |  | 998 us-gaap_TradingSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundMember | [1]
Offshore fund | Significant Other Inputs (Level 2) | Energy and natural resources sectors |  |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Trading, fair value | 465 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / invest_InvestmentSectorAxis = grow_EnergyAndNaturalResourceSectorsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_OffshoreFundMember |  |  |  |
Corporate debt |  |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Transfer into Level 3 | 343 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  | 0 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |
Corporate debt | Significant Other Inputs (Level 2) |  |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Investments, fair value | $ 97 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |  |  |
Trading securities | Offshore fund | Significant Other Inputs (Level 2) |  |  |  |  |
Fair Value Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |
Minimum redemption notice period of investment | 45 days |  |  |  |
[1] | Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.

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