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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Near-Term Tax Free Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Near-Term Tax Free Fund seeks to provide a high level of current income that is exempt from federal income taxation and to preserve capital.

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)
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
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 0.50%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.75%
Total annual fund operating expenses rr_ExpensesOverAssets 1.25%
Expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.80%) [1]
Total annual fund operating expenses after expense reimbursement rr_NetExpensesOverAssets 0.45%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2014-04-30
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 7% for the fiscal year ended December 31, 2012.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 7.00%
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, the fund's operating expenses remain the same and the expense limitation arrangement is not continued after the first year. 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 56
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 327
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 619
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,451
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 46
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 317
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 609
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,441
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" fundamental analysis to determine weightings in geographic regions, sectors and individual securities. The Adviser believes government policies are a precursor to change, and as a result, it monitors and tracks fiscal and monetary policies. The Adviser focuses on historical interest rate cycles and demographic trends.


In selecting investments, the Adviser will consider a bond's credit analysis, structure (maturity, coupon, redemption features), and yield. The Adviser reviews these factors to determine the relative value of the bond in comparison to its market value and the market value of similar bonds.


Under normal market conditions, the Near-Term Tax Free Fund invests at least 80% of its net assets in investment grade municipal securities whose interest is free from federal income tax, including the federal alternative minimum tax. The fund will maintain a weighted-average portfolio maturity of five years or less. Although the fund intends to invest the majority of its assets in tax free securities, it may invest up to 20% of its assets in securities that pay taxable interest.


The fund invests only in debt securities that, at the time of acquisition, have one of the four highest ratings by Moody's Investors Services (Aaa, Aa, A, Baa) or by Standard & Poor's Corporation (AAA, AA, A, BBB) (or, if not rated by Moody's or S&P, are determined by the Adviser to be of comparable quality). The fund will not invest more than 10% of its total assets in the fourth rating category. Investments in the fourth category may have speculative characteristics and, therefore, may involve higher risks.


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.

Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

•  Main Risk. The fund is designed for investors who primarily seek current income that is substantially free from federal income tax. As with all mutual funds, loss of money is a risk of investing in the fund. Although the fund's policy is to invest in securities whose interest is free from federal income tax, the fund may invest up to 20% of its assets in securities that pay taxable interest. For the fiscal year ended December 31, 2012, 5.87% of the fund's distributions was from ordinary income. From year to year, this number may vary and there is no assurance that these distributions will continue.


•  Interest Rate Risk. Because the fund invests primarily in municipal securities, there is a risk that the value of these securities will fall if interest rates rise. Ordinarily, when interest rates go up, municipal security prices fall. The opposite is also true: municipal security prices usually go up when interest rates fall. The longer a fund's weighted-average maturity, the more sensitive it is to changes in interest rates.


•  Call Risk. A municipal security may be prepaid (called) before its maturity. An issuer is more likely to call its securities when interest rates are falling, because the issuer can issue new securities with lower interest payments. If a security is called, a fund may have to replace it with a lower-yielding security.


•  Credit Risk. There is a possibility that an issuer of a municipal security cannot make timely interest and principal payments on its debt securities. With municipal securities, state or local law may limit the sources of funds for the payment of principal and interest.


•  Income Risk. The fund is subject to income risk, which is the risk that a fund's dividends (income) will decline due to falling interest rates.


•  Municipal Bond Risk. There is generally more public information available for corporate equities or bonds than is available for municipal bonds.


•  Liquidity Risk. The secondary market for municipal bonds may be less liquid than other securities markets. A less liquid market may make it difficult for the funds to sell the security at an attractive price, and the value of the security may fall, even during periods of declining interest rates.


•  Insured Municipal Bonds. The fund may invest in municipal bonds covered by an insurance policy that guarantees timely payment of principal and interest. The insurance policies do not guarantee the value of the bonds. A downgrade of the bond insurer's credit rating or a default by the insurer may result in a downgrade of the bond rating and could have a negative affect on the value of the bond.


•  Lower Rated Municipal Bonds. A portion of the fund's investments may be in high risk, lower rated municipal bonds as the result of a downgrade of an investment grade bond subsequent to the fund's purchase of the bond. Investments in lower rated bonds carry greater credit rate risk, market risk and interest rate risk than an investment in a higher rated bond.


•  Recent Market Events. Recent unprecedented turbulence in the financial markets and reduced liquidity in the credit and fixed income market could have an adverse effect on the value of the fund.

Risk Lose Money [Text] rr_RiskLoseMoney As with all mutual funds, loss of money is a risk of investing in 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 a broad-based securities market index. 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) Near-Term Tax Free Fund
Annual Return 2003 rr_AnnualReturn2003 3.31%
Annual Return 2004 rr_AnnualReturn2004 1.75%
Annual Return 2005 rr_AnnualReturn2005 0.98%
Annual Return 2006 rr_AnnualReturn2006 2.89%
Annual Return 2007 rr_AnnualReturn2007 4.53%
Annual Return 2008 rr_AnnualReturn2008 3.25%
Annual Return 2009 rr_AnnualReturn2009 5.00%
Annual Return 2010 rr_AnnualReturn2010 2.95%
Annual Return 2011 rr_AnnualReturn2011 4.24%
Annual Return 2012 rr_AnnualReturn2012 2.67%
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best quarter shown in the bar chart above: 2.53% in the third quarter of 2009.


Worst quarter shown in the bar chart above: (1.57)% in the second quarter of 2004.

Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.53%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2004
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.57%)
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 2.67%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.62%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.15%
After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.64%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.54%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.07%
After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.49%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.40%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.02%
Barclays Capital 3-Year Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.86%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.66%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.17%
[1] The Adviser has contractually limited the total fund operating expenses (exclusive of acquired fund fees and expenses, extraordinary expenses, taxes, brokerage commissions and interest) to not exceed 0.45% for the Near-Term Tax Free Fund on an annualized basis through April 30, 2014. This arrangement may not be changed or terminated during this period without approval of the fund's Board of Trustees and may be changed or terminated by the Adviser at any time after April 30, 2014.