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INVESTMENTS - Components of Company's Trading and Available-for-Sale Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Schedule of Trading Securities and Available-for-sale Securities [Line Items]    
Trading, cost $ 17,241us-gaap_TradingSecuritiesCost [1] $ 18,067us-gaap_TradingSecuritiesCost [1]
Trading, gross unrealized gain 140grow_TradingSecuritiesGrossUnrealizedGain [1] 92grow_TradingSecuritiesGrossUnrealizedGain [1]
Trading, gross unrealized (loss) (938)grow_TradingSecuritiesGrossUnrealizedLoss [1] (342)grow_TradingSecuritiesGrossUnrealizedLoss [1]
Trading securities, at fair value 16,443us-gaap_TradingSecurities [1] 17,817us-gaap_TradingSecurities [1]
Available-for-sale, cost 4,750us-gaap_AvailableForSaleSecuritiesAmortizedCost [2] 4,851us-gaap_AvailableForSaleSecuritiesAmortizedCost [2]
Available-for-sale, gross unrealized gain 603us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax [2] 1,425us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax [2]
Available-for-sale, gross unrealized (loss) (1,050)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax [2] (80)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax [2]
Available-for-sale, fair value 4,303us-gaap_AvailableForSaleSecuritiesNoncurrent [2] 6,196us-gaap_AvailableForSaleSecuritiesNoncurrent [2]
Available-for-sale, net unrealized gain (loss), gross (447)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax 1,345us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Available-for-sale, net unrealized gain (loss), net of tax (295)grow_AvailableForSaleUnrealizedHoldingGainLossOnAvailableForSaleSecuritiesNetOfTax 888grow_AvailableForSaleUnrealizedHoldingGainLossOnAvailableForSaleSecuritiesNetOfTax
Offshore fund    
Schedule of Trading Securities and Available-for-sale Securities [Line Items]    
Trading, cost 1,184us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1] 1,184us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1]
Trading, gross unrealized gain 0grow_TradingSecuritiesGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1] 0grow_TradingSecuritiesGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1]
Trading, gross unrealized (loss) (719)grow_TradingSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1] (186)grow_TradingSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1]
Trading securities, at fair value 465us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1] 998us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OffshoreFundMember		 [1]
Mutual funds - Fixed income    
Schedule of Trading Securities and Available-for-sale Securities [Line Items]    
Trading, cost 15,441us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [1] 16,241us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [1]
Trading, gross unrealized gain 140grow_TradingSecuritiesGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [1] 92grow_TradingSecuritiesGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [1]
Trading, gross unrealized (loss) (1)grow_TradingSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [1] 0grow_TradingSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [1]
Trading securities, at fair value 15,580us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [1] 16,333us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [1]
Available-for-sale, cost 1,228us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [3] 1,228us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [3]
Available-for-sale, gross unrealized gain 14us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [3] 21us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [3]
Available-for-sale, gross unrealized (loss) (13)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [3] (2)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [3]
Available-for-sale, fair value 1,229us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [3] 1,247us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FixedIncomeFundsMember		 [3]
Mutual funds - Domestic equity    
Schedule of Trading Securities and Available-for-sale Securities [Line Items]    
Trading, cost 535us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [1] 535us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [1]
Trading, gross unrealized gain 0grow_TradingSecuritiesGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [1] 0grow_TradingSecuritiesGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [1]
Trading, gross unrealized (loss) (137)grow_TradingSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [1] (76)grow_TradingSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [1]
Trading securities, at fair value 398us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [1] 459us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [1]
Available-for-sale, cost 543us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [3] 543us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [3]
Available-for-sale, gross unrealized gain 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [3] 7us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [3]
Available-for-sale, gross unrealized (loss) (75)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [3] 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [3]
Available-for-sale, fair value 468us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [3] 550us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_MutualFundsDomesticEquityMember		 [3]
Other    
Schedule of Trading Securities and Available-for-sale Securities [Line Items]    
Trading, cost 81us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [1] 107us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [1]
Trading, gross unrealized gain 0grow_TradingSecuritiesGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [1] 0grow_TradingSecuritiesGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [1]
Trading, gross unrealized (loss) (81)grow_TradingSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [1] (80)grow_TradingSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [1]
Trading securities, at fair value 0us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [1] 27us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [1]
Available-for-sale, cost 170us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [3] 232us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [3]
Available-for-sale, gross unrealized gain 3us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [3] 9us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [3]
Available-for-sale, gross unrealized (loss) (5)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [3] (1)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [3]
Available-for-sale, fair value 168us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [3] 240us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_OtherSecuritiesMember		 [3]
Common stock - Domestic    
Schedule of Trading Securities and Available-for-sale Securities [Line Items]    
Available-for-sale, cost 575us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockDomesticMember		 [3] 535us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockDomesticMember		 [3]
Available-for-sale, gross unrealized gain 367us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockDomesticMember		 [3] 586us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockDomesticMember		 [3]
Available-for-sale, gross unrealized (loss) (13)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockDomesticMember		 [3] (3)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockDomesticMember		 [3]
Available-for-sale, fair value 929us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockDomesticMember		 [3] 1,118us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockDomesticMember		 [3]
Common stock - International    
Schedule of Trading Securities and Available-for-sale Securities [Line Items]    
Available-for-sale, cost 652us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockInternationalMember		 [3] 607us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockInternationalMember		 [3]
Available-for-sale, gross unrealized gain 219us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockInternationalMember		 [3] 802us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockInternationalMember		 [3]
Available-for-sale, gross unrealized (loss) (32)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockInternationalMember		 [3] 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockInternationalMember		 [3]
Available-for-sale, fair value 839us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockInternationalMember		 [3] 1,409us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= grow_CommonStockInternationalMember		 [3]
Corporate debt    
Schedule of Trading Securities and Available-for-sale Securities [Line Items]    
Available-for-sale, cost 1,582us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [3] 1,706us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [3]
Available-for-sale, gross unrealized gain 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [3] 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [3]
Available-for-sale, gross unrealized (loss) (912)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [3] (74)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [3]
Available-for-sale, fair value $ 670us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [3] $ 1,632us-gaap_AvailableForSaleSecuritiesNoncurrent
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [3]
[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.
[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.