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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading World Precious Minerals Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The World Precious Minerals Fund seeks long-term growth of capital plus protection against inflation and monetary instability.

Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that you may pay if you buy and hold Investor Class shares of the fund. These fees are paid directly from your investment.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Maximum sales charge rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (0.05%)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management fee rr_ManagementFeesOverAssets 0.74%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.46%
Total annual fund operating expenses rr_ExpensesOverAssets 1.45%
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes where fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's performance. The fund had a portfolio turnover rate of 44% for the fiscal year ended December 31, 2012.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Investor Class of the fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% annual return and the fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your cost would be:

Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If you redeem your shares:
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 158
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 469
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 802
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,745
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If you do not redeem your shares:
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 148
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 459
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 792
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,735
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Adviser uses a matrix of "top-down" macro models and "bottom-up" micro stock selection models to determine weighting in countries, sectors and individual securities. The Adviser believes government policies are a precursor to change, and as a result, it monitors and tracks the fiscal and monetary policies of the world's largest countries both in terms of economic stature and population. The Adviser focuses on historical and socioeconomic cycles, and it applies both statistical and fundamental models, including "growth at a reasonable price" (GARP), to identify companies with superior growth and value metrics. The Adviser overlays these explicit knowledge models with the tacit knowledge obtained by domestic and global travel for first-hand observation of local and geopolitical conditions, as well as specific companies and projects.


Under normal market conditions, the fund will invest at least 80% of its net assets in equity and equity-related securities of companies principally engaged in the exploration for, or mining and processing of, precious minerals such as gold, silver, platinum group, palladium and diamonds. The fund may invest in these precious minerals directly and/or in equity and equity-related securities, such as exchange-traded funds, that represent interests in, or related to, these precious minerals. The equity and equity-related securities in which the fund primarily invests are common stocks, preferred stocks, convertible securities, rights and warrants, and depository receipts (ADRs and GDRs). The fund also participates in private placements, initial public offerings (IPOs), and long-term equity anticipation securities (LEAPS).


The fund may invest in warrants to gain exposure to individual securities in the gold and precious metals industry over the long term. Warrants allow the fund to imitate a purchase or sale of a stock for a fraction of its price (premium) and hold that option for a long period of time before it expires. The fund may also receive warrants when it participates in a private placement. The issuer of the private placement may provide a warrant as an incentive for investing in the initial financing of the company.


The fund focuses on selecting junior and intermediate exploration companies from around the world. Junior exploration companies typically have small market capitalization and no source of steady cash flow, and their growth generally comes from a major mining discovery. Therefore, the risk and opportunities are substantially greater than investing in a senior mining company with proven reserves. The volatility of these smaller mining companies is typically greater than that of senior producers.


In making security selections for junior and intermediate mining investments, the Adviser looks for companies with proven management who have a strong track record in developing and producing mining companies and whose potential mining assets and financial structure have upside leverage to a rising commodity price. The Adviser's stock selection process for established mining companies looks to identify companies with robust reserve growth profiles and strong cash flows.


The fund will invest in securities of companies with economic ties to countries throughout the world, including the U.S. Under normal market conditions, the fund will invest at least 40% of its assets in securities of companies that are economically tied to at least three countries other than the U.S. The fund may invest in companies which may be domiciled in one country but have economic ties to another country. In determining if a company is economically tied to a country, the Adviser will consider various factors, including the country in which the company's principal operations are located; the country in which the company's mining or natural resource reserves are located; the country in which 50% of the company's revenues or profits are derived from goods produced or sold, investments made, or services performed; the country in which the principal trading market is located; and the country in which the company is legally organized.


Although the fund has greater latitude to invest its assets in different precious minerals or metals stocks, it currently has significant investments in gold sector stocks. Gold companies include mining companies that exploit gold deposits that are supported by co-products and by-products such as copper, silver, lead and zinc, and also diversified mining companies which produce a meaningful amount of gold.


The fund is non-diversified and, therefore, may invest a greater percentage of its assets in a particular issuer in comparison to a diversified fund.


The fund also may purchase call and put options, and enter into covered option writing transactions. In addition, the fund may invest up to 15% of its net assets in illiquid securities.


The Adviser uses a matrix of statistical models to monitor market volatility and money flows, and as a result, it may at times maintain higher than normal cash levels. For example, the Adviser may take a temporary defensive position when the securities trading markets or the economy are experiencing excessive volatility, a prolonged general decline, or other adverse conditions.

Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal market conditions, the fund will invest at least 80% of its net assets in equity and equity-related securities of companies principally engaged in the exploration for, or mining and processing of, precious minerals such as gold, silver, platinum group, palladium and diamonds.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

•  Main Risk. As with all mutual funds, loss of money is a risk of investing in the fund.


•  Market Risk. The value of the fund's shares will go up and down based on the performance of the companies whose securities it owns and other factors affecting the securities market generally.


•  Portfolio Management Risk. The skill of the Adviser will play a significant role in the fund's ability to achieve its investment objectives. There is a risk that the investment strategy does not achieve the fund's objectives or that the Adviser does not implement the strategy properly.


•  Foreign Securities Risk/Emerging Markets Risk. The fund's investments in foreign securities are subject to special risks. The fund's returns and share price may be affected to a large degree by several factors, including fluctuations in currency exchange rates; political, social or economic instability; the rule of law with respect to the recognition and protection of property rights; and less stringent accounting, disclosure and financial reporting requirements in a particular country. These risks are generally intensified in emerging markets. The fund's share prices will reflect the movements of the different stock markets in which it is invested and the currencies in which its investments are denominated.


•  Industry Concentration Risk. The fund concentrates its investments in precious minerals. The fund may be subject to greater risks and market fluctuations than a portfolio representing a broader range of industries. The fund invests in securities that typically respond to changes in the price of gold and other precious minerals, which can be influenced by a variety of global economic, financial and political factors; increased environmental and labor costs in mining; and changes in laws relating to mining or gold production or sales; and the price may fluctuate substantially over short periods of time. Therefore, the fund may be more volatile than other types of investments.


•  Junior and Intermediate Mining Companies Risk. The fund focuses its investments in junior and intermediate exploration companies. The securities of junior and intermediate exploration gold companies, which are often more speculative in nature, tend to be less liquid and more volatile in price than securities of larger companies.


•  Non-Diversification Risk. The fund is non-diversified and may invest a significant portion of its total assets in a small number of companies. This may cause the performance of the fund to be dependent upon the performance of one or more selected companies, which may increase the volatility of the fund.


•  Price Volatility Risk. The value of the fund's shares may fluctuate significantly.


•  Growth Stock Risk. Growth stocks generally experience share price fluctuations as the market reacts to changing perceptions of the underlying companies' growth potentials and broader economic activities.


•  Options Risk. Investing in options, LEAPS (an option that has an expiration date of up to two and one half years), and other instruments with option-type elements may increase the volatility and/or transaction expenses of the fund. An option may expire without value, resulting in a loss of the fund's initial investment and may be less liquid and more volatile than an investment in the underlying securities.


•  Warrants Risk. Warrants can provide a greater potential for profit or loss than an equivalent investment in the underlying security. Prices of warrants do not necessarily move, however, in tandem with prices of the underlying securities, particularly for shorter periods of time, and, therefore, may be considered speculative investments. If a warrant held by the fund were not exercised by the date of its expiration, the fund would incur a loss in the amount of the cost of the warrant.


•  Restricted Security Risk. The fund may make direct equity investments in securities that are subject to contractual and regulatory restrictions on transfer. These investments may involve a high degree of business and financial risk. The restrictions on transfer may cause the fund to hold a security at a time when it may be beneficial to liquidate the security, and the security could decline significantly in value before the fund could liquidate the security.


•  Gold and Precious Metals/Minerals Risk. The fund may invest in gold and precious minerals directly and/or in equity and equity-related securities, such as exchanged-traded funds that represent interests in, or related to, these precious metals and, therefore, is subject to the risk that it could fail to qualify as a regulated investment company under the Internal Revenue Code if the fund derives more than 10% of its gross income from these investments in gold and precious metals. Failure to qualify as a regulated investment company would result in adverse tax consequences to the fund and its shareholders.


•  Illiquidity Risk. Illiquid securities are those securities that cannot be disposed of in seven days or less at approximately the value at which a fund carries them on its balance sheet. These investments may involve a high degree of business and financial risk.

Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, loss of money is a risk of investing in the fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The fund is non-diversified and may invest a significant portion of its total assets in a small number of companies. This may cause the performance of the fund to be dependent upon the performance of one or more selected companies, which may increase the volatility of the fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table show the volatility of the fund's Investor Class share returns, which is one indicator of the risks of investing in the fund. The bar charts show changes in the fund's returns from year to year during the period indicated. The table compares the fund's average annual returns for the last 1-, 5- and 10-year periods to those of broad-based securities market indexes. How the fund performed in the past, before and after taxes, is not an indication of how it will perform in the future. You may obtain performance data current to the most recent month end at www.usfunds.com or by calling 1-800-873-8637.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table show the volatility of the fund's Investor Class share returns, which is one indicator of the risks of investing in the fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-873-8637
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.usfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture How the fund performed in the past, before and after taxes, is not an indication of how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (as of December 31 each year) World Precious Minerals Fund
Annual Return 2003 rr_AnnualReturn2003 92.70%
Annual Return 2004 rr_AnnualReturn2004 0.97%
Annual Return 2005 rr_AnnualReturn2005 30.89%
Annual Return 2006 rr_AnnualReturn2006 52.30%
Annual Return 2007 rr_AnnualReturn2007 23.02%
Annual Return 2008 rr_AnnualReturn2008 (52.96%)
Annual Return 2009 rr_AnnualReturn2009 89.50%
Annual Return 2010 rr_AnnualReturn2010 45.38%
Annual Return 2011 rr_AnnualReturn2011 (32.58%)
Annual Return 2012 rr_AnnualReturn2012 (11.23%)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best quarter shown in the bar chart above: 42.58% in the fourth quarter of 2003.


Worst quarter shown in the bar chart above: (38.70)% in the third quarter of 2008.

Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2003
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 42.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (38.70%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historic marginal individual federal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the periods ended December 31, 2012)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (11.23%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (4.95%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 13.97%
After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (11.23%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (7.45%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.72%
After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (7.30%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (5.22%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.98%
S&P 500 Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.00%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.66%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.09%
NYSE Arca Gold Miners Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (9.85%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.34%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.53%