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Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Jun. 28, 2011
American Trust Allegiance Fund (Prospectus Summary) | American Trust Allegiance Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Summary Section
Investment Objective, Heading rr_ObjectiveHeading Investment Objective
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The American Trust Allegiance Fund (the "Fund") seeks capital appreciation.
Expense, Heading rr_ExpenseHeading Fees and Expenses
Expense, Narrative rr_ExpenseNarrativeTextBlock 
This table describes the fees and expenses that you may pay if you buy and hold
shares of the Fund.
Shareholder Fees, Caption rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment) None
Operating Expenses, Caption rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading Portfolio Turnover.
Portfolio Turnover 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 when 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. During the
most recent fiscal year, the Fund's portfolio turnover rate was 76.63% of the
average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 76.63%
Expenses, Not Correlated to Ratio Due to Acquired Fund Fees rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses for the Fund do not correlate to the Ratio of Expenses to Average Net Assets Before Expense Waiver in the Financial Highlights of the statutory Prospectus, which reflects the operating expenses of the Fund and does not include acquired fund fees and expenses ("AFFE").
Expense Example, Heading rr_ExpenseExampleHeading Example.
Expense Example, Narrative 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 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% return each year, and that the Fund's operating
expenses remain the same (taking into account the Expense Cap only in the first
year). Although your actual costs may be higher or lower, based on these
assumptions, your costs would be:
Investment Strategy, Heading rr_StrategyHeading Principal Investment Strategies
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock 
The Advisor selects principally domestic and foreign stocks for the Fund's
portfolio that it expects will appreciate in value over the long term. Under
normal market conditions, the Fund will invest at least 85% of its net assets
(plus any borrowings for investment purposes) in foreign and domestic equity
securities including both long and short positions. The Advisor uses a "bottom
up" approach to stock investing and does not attempt to forecast the U.S.
economy, interest rates, inflation or the U.S. stock market. It focuses on
finding companies that meet its financial criteria, including either a history
of consistent earnings and revenue growth or strong prospects of earnings and
revenue growth, and a strong balance sheet. With respect to long equity
positions, the Advisor purchases the securities of a company with the intention
of holding them, under normal circumstances, for a minimum of three
years. Companies should demonstrate leadership, operating momentum and strong
prospects for annual growth rates of 10% or better. The Advisor may decide to
sell a security due to changes in fundamentals, such as marked deceleration in
earnings growth, decline in revenues or deterioration of the balance sheet, or a
change in a company's valuation or competitive position. Normally, the companies
in which the Fund invests represent nine major economic or market sectors:
consumer discretionary, consumer staples, energy, financial services,
technology, industrials, utilities, telecommunications, and materials.

The Fund avoids investments in companies that have significant involvement in
the tobacco, pharmaceuticals, biotechnology, medical diagnostic services and
products, gambling and liquor industries, although the Fund may engage in short
sales of these companies. While the Fund may invest in or sell short a company
that conducts operations in one of these industries, the Fund will not invest in
such a company unless current revenues from these industries represent less than
5% of the total revenues of the company at the time of investment. The majority
of companies in which the Fund invests will have no operations in these
industries.

The Advisor expects that the Fund's portfolio will generally consist predominantly
of mid- and large-capitalization stocks, but in some marketenvironments
small-capitalization stocks may constitute a large portion of the Fund's portfolio.
The Advisor considers a small-capitalization stock to be one with a market
capitalization of less than $1 billion at the time of investment;
a mid-capitalization stock to be one with a market capitalization of between $1
billion and $10 billion at the time of investment; and a large-capitalization
stock to be one with a market capitalization of more than $10 billion at the
time of investment. The Fund may invest up to 40% of its net assets in foreign
companies, including up to 30% of the Fund's net assets in emerging markets,
through U.S. listed securities, depositary receipts or through purchases on
foreign exchanges.
Risk, Heading rr_RiskHeading Principal Investment Risks
Risk, Narrative rr_RiskNarrativeTextBlock 
Losing all or a portion of your investment is a risk of investing in the
Fund. There is no assurance that the Fund's investment objective will be
achieved. The following principal risks could affect the value of your
investment:

o Market Risk. Market risk is the risk that the market value of a security may
  fluctuate, sometimes rapidly and unpredictably, and you could lose money.

o Management Risk. Management risk means that your investment in the Fund varies
  with the success and failure of the Advisor's investment strategies, as well as
  the Advisor's research, analysis and determination of portfolio securities.

o Socially Responsible Investing Policy Risk. The Fund's portfolio is subject to
  socially responsible investment criteria. As a result, the Fund may pass up
  opportunities to buy certain securities when it is otherwise advantageous to do
  so, or may sell securities for social reasons when it is otherwise
  disadvantageous to do so.

o Equity Risk. The risks that could affect the value of the Fund's shares and the
  total return on your investment include the possibility that the equity
  securities held by the Fund may experience sudden, unpredictable drops in value
  or long periods of decline in value.

o Small- and Medium-Sized Company Risk. Securities of companies with smaller
  market capitalizations tend to be more volatile and less liquid than larger
  market capitalization stocks.

o Foreign Securities Risk. Foreign securities can be more volatile than domestic
  (U.S.) securities. Securities markets of other countries are generally smaller
  than U.S. securities markets. Many foreign securities may also be less liquid
  than U.S. securities, which could affect the Fund's investments. In addition,
  investments made in foreign currencies may be subject to the risk of currency
  devaluation or exchange rate risk.

o Emerging Markets Risk. Investing in securities of issuers located in emerging
  markets poses greater risk of social, political and economic instability,
  which could affect the Fund's investments. Emerging market countries may have
  smaller securities markets and therefore less liquidity and greater price
  volatility than more developed markets.

o Sector Risk. Sector risk is the risk that investments within the same economic
  sector may decline in price due to sector-specific market or economic
  developments.

o Short Sales Risk. Short sales involve specific risk considerations and may be
  considered a speculative technique. In addition, under adverse market
  conditions the Fund might have difficulty purchasing securities to meet its
  short sale delivery obligations, and might have to sell portfolio securities
  to raise the capital necessary to meet its short sale obligations at a time
  when fundamental investment considerations would not favor such sales.

The Fund may be appropriate for investors who:

o Want exposure to investments in companies that promote social responsibility;

o Are pursuing a long-term goal such as retirement and those seeking the
  potential for long-term capital appreciation; and

o Are willing to accept higher short-term risk along with higher potential for
  long-term growth of capital.
Risk, Lose Money rr_RiskLoseMoney Losing all or a portion of your investment is a risk of investing in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading Fund Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock 
The following performance information provides some indication of the risks of
investing in the Fund. The bar chart shows changes in the Fund's performance
from year to year. The table shows how the Fund's average annual returns for 1,
5, 10 years, and since inception, compare with those of a broad measure of
market performance. The Fund's past performance, before and after taxes, is not
necessarily an indication of how the Fund will perform in the future. Updated
performance information is available on the Fund's website at
www.allegiancefund.com or by calling toll free at 1-800-385-7003.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Fund.
Performance, Availability Phone Number rr_PerformanceAvailabilityPhone 1-800-385-7003
Performance, Availability Website Address rr_PerformanceAvailabilityWebSiteAddress www.allegiancefund.com
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart, Heading rr_BarChartHeading Calendar Year Total Returns as of December 31 [1]
Bar Chart, Closing rr_BarChartClosingTextBlock 
During the period shown in the bar chart, the Fund's highest quarterly return
was 20.34% for the quarter ended June 30, 2009, and the lowest quarterly return
was -23.03% for the quarter ended March 31, 2001.
Performance Table, Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table, Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to those who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts ("IRAs").
Performance Table, One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown Actual after-tax returns depend on your situation and may differ from those shown.
Performance Table, Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In addition, the "Return after Taxes on Distributions and Sale of Fund Shares" is higher than other return figures when a capital loss occurs upon the redemption of Fund shares.
Performance Table, Closing rr_PerformanceTableClosingTextBlock 
After-tax returns are calculated using the historical highest individual federal
marginal income tax rates and do not reflect the impact of state and local
taxes. Actual after-tax returns depend on your situation and may differ from
those shown. After-tax returns shown are not relevant to those who hold their
shares through tax-deferred arrangements such as 401(k) plans or individual
retirement accounts ("IRAs"). In addition, the "Return after Taxes on
Distributions and Sale of Fund Shares" is higher than other return figures when
a capital loss occurs upon the redemption of Fund shares.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the periods ended December 31, 2010)
American Trust Allegiance Fund (Prospectus Summary) | American Trust Allegiance Fund | Investor Class
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-06-28
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 6.90%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.34%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2001
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.03%)
American Trust Allegiance Fund | S&P 500® Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel S&P 500® Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.06%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.29%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.41%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.05%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 11, 1997
American Trust Allegiance Fund | Investor Class
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.95%
Other Expenses rr_OtherExpensesOverAssets 1.19%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.14% [2]
Less: Fee Waivers rr_FeeWaiverOrReimbursementOverAssets (0.68%) [3]
Net Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.46%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 149
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 605
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,087
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,419
Annual Return 2001 rr_AnnualReturn2001 (27.01%)
Annual Return 2002 rr_AnnualReturn2002 (18.28%)
Annual Return 2003 rr_AnnualReturn2003 26.08%
Annual Return 2004 rr_AnnualReturn2004 10.10%
Annual Return 2005 rr_AnnualReturn2005 4.04%
Annual Return 2006 rr_AnnualReturn2006 9.30%
Annual Return 2007 rr_AnnualReturn2007 11.51%
Annual Return 2008 rr_AnnualReturn2008 (34.91%)
Annual Return 2009 rr_AnnualReturn2009 29.40%
Annual Return 2010 rr_AnnualReturn2010 13.11%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 13.11%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.04%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 none
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.47%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 11, 1997
American Trust Allegiance Fund | Investor Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 13.10%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.98%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 (0.08%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.34%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 11, 1997
American Trust Allegiance Fund | Investor Class | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.55%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.59%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 (0.03%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.80%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 11, 1997
[1] The Fund's year-to-date total return as of March 31, 2011 was 6.90%.
[2] The Total Annual Fund Operating Expenses for the Fund do not correlate to the Ratio of Expenses to Average Net Assets Before Expense Waiver in the Financial Highlights of the statutory Prospectus, which reflects the operating expenses of the Fund and does not include acquired fund fees and expenses ("AFFE").
[3] American Trust Investment Advisors, LLC (the "Advisor") has contractually agreed to waive a portion or all of its management fee and/or pay Fund expenses (excluding AFFE, interest, taxes and extraordinary expenses), to ensure that Net Annual Fund Operating Expenses do not exceed 1.45% of the Fund's average daily net assets (the "Expense Cap"). The Expense Cap will remain in effect through at least June 28, 2012, and may be terminated only by the Trust's Board of Trustees (the "Board" or "Trustees"). The Advisor may request recoupment of previously waived fees and paid expenses from the Fund for three years from the date they were waived or paid, subject to the Expense Cap.