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INVESTMENTS - Additional Information (Detail) (USD $) | Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Carrying value of investments held | $ 21,562,000 grow_TradingAndAvailableForSaleSecuritiesFairValueDisclosure |  |  |  |
Cost basis of investments held | 22,700,000 grow_TradingAndAvailableForSaleSecuritiesAmortizedCost |  |  |  |
Other investments | 2,413,000 us-gaap_OtherLongTermInvestments |  | 1,413,000 us-gaap_OtherLongTermInvestments |  |
Carrying value of investments to Company's total assets | 69.50%grow_ValueofInvestmentstoCompanyAssets |  |  |  |
Trading securities, at fair value | 17,015,000 us-gaap_TradingSecurities | [1] | 17,817,000 us-gaap_TradingSecurities | [1] |
Government Fund | Mutual funds |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |
Trading securities, at fair value |  |  |  |  | $ 14,100,000 us-gaap_TradingSecurities / grow_FundNameAxis = grow_GovernmentFundMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = grow_MutualFundsMember
[1] | Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.

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- Definition Other long-term investments not otherwise specified in the taxonomy, not including investments in marketable securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph f -Article 7 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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