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STOCKHOLDERS' EQUITY - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2015 | Dec. 07, 2012 | Dec. 10, 2014 | Dec. 12, 2013
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Payments for repurchase of common stock |  |  | $ 206,000 us-gaap_PaymentsForRepurchaseOfCommonStock | $ 110,000 us-gaap_PaymentsForRepurchaseOfCommonStock |  |  |  |
Number of options outstanding | 22,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  | 22,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |  |
Number of options exercisable | 22,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  | 22,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber |  |  |  |  |
Weighted average exercise price, outstanding options (in dollars per share) | $ 18.72 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  | $ 18.72 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |  |  |  |
Weighted average exercise price, exercisable options (in dollars per share) | $ 18.72 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |  | $ 18.72 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |  |  |  |  |
Number of options granted |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |  |  |  |  |
Number of options exercised during period |  |  | 0 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |
Number of options, options forfeited |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod |  |  |  |  |
Stock-based compensation expense | 0 us-gaap_AllocatedShareBasedCompensationExpense | 1,000 us-gaap_AllocatedShareBasedCompensationExpense | 0 us-gaap_AllocatedShareBasedCompensationExpense | 1,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |
Unrecognized share-based compensation cost | 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | 7,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | 7,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |
Common Class A |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Repurchased shares | 50,212 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 28,227 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 67,005 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 41,446 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Payments for repurchase of common stock | 147,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 73,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 206,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 110,000 us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Share Repurchase Plan - December 2012 |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  | 2,750,000.00 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = grow_ShareRepurchasePlanDecember2012Member |  |
Share Repurchase Renewal, December 2013 |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 2,750,000.00 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = grow_ShareRepurchaseRenewalDecember2013Member | $ 2,750,000.00 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = grow_ShareRepurchaseRenewalDecember2013Member
Forecast |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Cash dividend declared monthly (per share) |  |  |  |  | $ 0.005 grow_MonthlyDeclaredDividend / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |

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