XML 26 R31.htm IDEA: XBRL DOCUMENT v2.4.1.9
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 $ 20,700,000grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure   $ 20,700,000grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure      
Cost basis of investments held 22,000,000grow_TradingAndAvailableForSaleSecuritiesAmortizedCost   22,000,000grow_TradingAndAvailableForSaleSecuritiesAmortizedCost      
Other investments 2,413,000us-gaap_OtherLongTermInvestments   2,413,000us-gaap_OtherLongTermInvestments   1,413,000us-gaap_OtherLongTermInvestments  
Carrying value of investments to Company's total assets 70.10%grow_ValueofInvestmentstoCompanyAssets   70.10%grow_ValueofInvestmentstoCompanyAssets      
Trading securities, at fair value 16,443,000us-gaap_TradingSecurities [1]   16,443,000us-gaap_TradingSecurities [1]   17,817,000us-gaap_TradingSecurities [1]  
Other than temporary declines in securities 105,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities 3,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities 105,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities 3,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities    
Amortized cost basis, subject to impairment loss 4,750,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [2]   4,750,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [2]   4,851,000us-gaap_AvailableForSaleSecuritiesAmortizedCost [2]  
Offshore fund            
Schedule of Trading Securities and Other Trading Assets [Line Items]            
Carrying value of investments held 465,000grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		   465,000grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		      
Trading securities, at fair value 465,000us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1]   465,000us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1]   998,000us-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 1grow_AvailableForSaleSecuritiesSubjectToImpairmentLossQualitativeDisclosureNumberOfPositions
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CorporateDebtSecuritiesOneMember		   1grow_AvailableForSaleSecuritiesSubjectToImpairmentLossQualitativeDisclosureNumberOfPositions
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CorporateDebtSecuritiesOneMember		      
Amortized cost basis, subject to impairment loss 44,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CorporateDebtSecuritiesOneMember		   44,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CorporateDebtSecuritiesOneMember		      
Available-for-sale securities, fair value, subject to impairment loss 15,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CorporateDebtSecuritiesOneMember		   15,000us-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 310,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CorporateDebtSecuritiesTwoMember		   310,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CorporateDebtSecuritiesTwoMember		      
Available-for-sale securities, fair value, subject to impairment loss 234,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CorporateDebtSecuritiesTwoMember		   234,000us-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           14,100,000us-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 $ 17,500,000grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= grow_UnitedStatesGlobalInvestorsFundsMember		   $ 17,500,000grow_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.