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FAIR VALUE DISCLOSURES - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Dec. 31, 2014
Jun. 30, 2014
Fair Value Assets Liabilities Quantitative Information [Line Items]    
Transfer from Level 1 to Level 2, amount 87us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount  
Trading, fair value 17,015us-gaap_TradingSecurities [1] 17,817us-gaap_TradingSecurities [1]
Available-for-sale, fair value 4,547us-gaap_AvailableForSaleSecuritiesNoncurrent [2] 6,196us-gaap_AvailableForSaleSecuritiesNoncurrent [2]
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 95.00%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 4.00%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 1.00%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 560us-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 560us-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]    
Available-for-sale, fair value 620us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
[3] 1,632us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
[3]
Corporate debt | Significant Other Inputs (Level 2)    
Fair Value Assets Liabilities Quantitative Information [Line Items]    
Investments, fair value 382us-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.
[2] Net unrealized gains (losses) on available-for-sale securities gross and net of tax as of December 31, 2014, are $(323) and $(213), respectively, and as of June 30, 2014, are $1,345 and $888, respectively.
[3] Unrealized gains and losses on available-for-sale securities are excluded from earnings and recorded in other comprehensive income as a separate component of shareholders’ equity until realized.