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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 $ 82us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount    
Transfer into Level 3 343us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3    
Trading, fair value 16,443us-gaap_TradingSecurities [1]   17,817us-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 465us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1]   998us-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 465us-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 343us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 0us-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 $ 97us-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.