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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Dec. 31, 2021
Entity Registrant Name dei_EntityRegistrantName FENIMORE ASSET MANAGEMENT TRUST
Entity Central Index Key dei_EntityCentralIndexKey 0000797136
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Amendment Flag dei_AmendmentFlag false
Trading Symbol dei_TradingSymbol fam
Document Creation Date dei_DocumentCreationDate Apr. 25, 2022
Document Effective Date dei_DocumentEffectiveDate May 01, 2022
Prospectus Date rr_ProspectusDate May 01, 2022
Investor [Member] | FAM Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Value Fund – Investor Shares SUMMARY SECTION    
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

FAM Value Fund’s investment objective is to maximize long-term return on capital.

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

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

 
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2023
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 when Fund shares are held in a taxable account. These costs, which are not reflected in the 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 6% of the average value of its portfolio.

 
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 6.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”
Expense Example [Heading] rr_ExpenseExampleHeading Expense 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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:   Expense Example
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Fenimore Asset Management, Inc. (“Fenimore”), the investment advisor to the Fund, employs a “value approach” in making its common stock selections. This approach is based on Fenimore’s belief that at any given point in time the stock price of a company may sell below the company’s “true business worth”. Factors considered in evaluating the true business worth include the company’s current earnings and Fenimore’s opinion as to its future earnings potential. After identifying a company whose securities are determined to have a favorable price-to-earnings relationship, Fenimore plans to invest in such securities until the “true business worth” nears the market price of the company’s securities.

 

Generally, the Fund will attempt to remain fully invested in common stocks and securities that are convertible into common stocks, such as convertible bonds and convertible preferred stocks. The Fund may invest in the securities of issuers of all sizes and market capitalizations. The Fund may also invest in the securities of both domestic and foreign issuers and it may invest in shares of other investment companies, including exchange-traded funds (“ETFs”).

 
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
●Stock Market Risk - the value of stocks fluctuates in response to the activities of individual companies and general stock market and economic conditions. Stock prices may decline over short or extended periods of time. Stocks are more volatile and riskier than some other forms of investments.

 

●Stock Selection Risk - the value stocks chosen for the Fund are subject to the risk that the market may never realize their intrinsic value or their prices may go down.

 

●Small-Cap Risk - small capitalization companies may not have the size, resources or other assets of large capitalization companies.

 

●Market Risk - the value of your investment will go up and down, which means that you could lose money. Market risk includes political, regulatory, economic, social and health risks (including the risks presented by the spread of infectious diseases) which can lead to increased market volatility and negative impacts on local and global financial markets, and the duration and severity of the impact of these risks on markets cannot be reasonably estimated.

 

●Foreign Investment Risk - the Fund may invest in securities of foreign issuers that are traded in foreign markets or may be represented by American Depository Receipts that are traded in the United States. Investments in non-U.S. securities may involve additional risk including exchange rate fluctuation, political or economic instability, the imposition of exchange controls, expropriation, limited disclosure and illiquid markets.

 

●Investment in Other Investment Companies Risk - the Fund may invest in shares of other investment companies, including ETFs. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests. In addition, shareholders will be exposed to the investment risks associated with investments in other investment companies.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Annual Total Return
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart shows changes in the Investor Shares performance since 2012. The table shows the Investor Shares average annual returns (before and after taxes) for the one year, five year and ten year periods compared to those of the Russell MidCap Index, the Fund’s primary benchmark index. 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 may be obtained at the Fund’s website fenimoreasset.com.

 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart shows changes in the Investor Shares performance since 2012. The table shows the Investor Shares average annual returns (before and after taxes) for the one year, five year and ten year periods compared to those of the Russell MidCap Index, the Fund’s primary benchmark index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress fenimoreasset.com
Performance Past Does Not Indicate Future [Text] 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 FAM VALUE FUND Investor Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter (2Q 2020):
15.75%
Worst Quarter (1Q 2020):
-23.73%

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.75%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.73%)
Performance Table Heading rr_PerformanceTableHeading AVERAGE TOTAL ANNUAL RETURN (for the periods ending December 31, 2021) Investor Shares
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown in the table 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 Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for the Investor Class and after-tax returns for other classes will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns shown in the table 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 the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt. After-tax returns are shown for the Investor Class and after-tax returns for other classes will vary.
Investor [Member] | FAM Value Fund | Russell MidCap Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 22.58%
5 Years rr_AverageAnnualReturnYear05 15.10%
10 Years rr_AverageAnnualReturnYear10 14.91%
Investor [Member] | FAM Value Fund | FAM Value Fund Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.19% [1],[2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.19% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 654
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,443
Annual Return 2012 rr_AnnualReturn2012 11.39%
Annual Return 2013 rr_AnnualReturn2013 32.96%
Annual Return 2014 rr_AnnualReturn2014 13.41%
Annual Return 2015 rr_AnnualReturn2015 (1.74%)
Annual Return 2016 rr_AnnualReturn2016 15.60%
Annual Return 2017 rr_AnnualReturn2017 17.00%
Annual Return 2018 rr_AnnualReturn2018 (6.18%)
Annual Return 2019 rr_AnnualReturn2019 30.32%
Annual Return 2020 rr_AnnualReturn2020 6.82%
Annual Return 2021 rr_AnnualReturn2021 25.63%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 25.63%
5 Years rr_AverageAnnualReturnYear05 13.94%
10 Years rr_AverageAnnualReturnYear10 13.86%
Investor [Member] | FAM Value Fund | FAM Value Fund Investor Class | Return after taxes on distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 24.21%
5 Years rr_AverageAnnualReturnYear05 12.66%
10 Years rr_AverageAnnualReturnYear10 12.55%
Investor [Member] | FAM Value Fund | FAM Value Fund Investor Class | Return after taxes on distributions and sale of fund shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 16.19%
5 Years rr_AverageAnnualReturnYear05 10.94%
10 Years rr_AverageAnnualReturnYear10 11.25%
Investor [Member] | FAM Dividend Focus Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Dividend Focus Fund – Investor Shares SUMMARY SECTION    
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

FAM Dividend Focus Fund’s investment objective is to provide current income as well as long-term capital appreciation by investing primarily (at least 80% of its total assets) in income-producing stocks that pay dividends.

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

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

 
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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)
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 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 4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 4.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”
Expense Example [Heading] rr_ExpenseExampleHeading Expense 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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:   Expense Example
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Fenimore Asset Management, Inc. (“Fenimore”), the investment advisor to the Fund employs a “value approach” in making its common stock selections. This approach is based on Fenimore’s belief that at any given point in time the stock price of a company may sell below the company’s “true business worth”. Factors considered in evaluating the true business worth include the company’s current earnings and Fenimore’s opinion as to its future earnings potential. After identifying a company whose securities are determined to have a favorable price-to-earnings relationship, Fenimore plans to invest in such securities until the “true business worth” nears the market price of the company’s securities.

 

Generally, the Fund will attempt to remain fully invested in common stocks and securities that are convertible into common stocks, such as convertible bonds and convertible preferred stocks. The Fund may invest in the securities of issuers of all sizes and market capitalizations. The Fund may also invest in the securities of both domestic and foreign issuers and it may invest in shares of other investment companies, including exchange-traded funds (“ETFs”).

 
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
●Stock Market Risk - the value of stocks fluctuates in response to the activities of individual companies and general stock market and economic conditions. Stock prices may decline over short or extended periods of time. Stocks are more volatile and riskier than some other forms of investments.

 

●Stock Selection Risk - the value stocks chosen for the Fund are subject to the risk that the market may never realize their intrinsic value or their prices may go down.

 

●Small-Cap Risk - small capitalization companies may not have the size, resources or other assets of large capitalization companies.

 

●Market Risk - the value of your investment will go up and down, which means that you could lose money. Market risk includes political, regulatory, economic, social and health risks (including the risks presented by the spread of infectious diseases) which can lead to increased market volatility and negative impacts on local and global financial markets, and the duration and severity of the impact of these risks on markets cannot be reasonably estimated.

 

●Foreign Investment Risk - the Fund may invest in securities of foreign issuers that are traded in foreign markets or may be represented by American Depository Receipts that are traded in the United States. Investments in non-U.S. securities may involve additional risk including exchange rate fluctuation, political or economic instability, the imposition of exchange controls, expropriation, limited disclosure and illiquid markets.

 

●Investment in Other Investment Companies Risk - the Fund may invest in shares of other investment companies, including ETFs. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests. In addition, shareholders will be exposed to the investment risks associated with investments in other investment companies.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Annual Total Return
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart shows changes in the Investor Shares performance since 2011. The table shows the Investor Shares average annual returns (before and after taxes) for the one year, five year and ten year periods compared to those of the Russell MidCap Index, the Fund’s primary benchmark index. 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 may be obtained at the Fund’s website fenimoreasset.com.

 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart shows changes in the Investor Shares performance since 2011. The table shows the Investor Shares average annual returns (before and after taxes) for the one year, five year and ten year periods compared to those of the Russell MidCap Index, the Fund’s primary benchmark index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress fenimoreasset.com
Performance Past Does Not Indicate Future [Text] 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 FAM DIVIDEND FOCUS FUND Investor Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter (2Q’20):
19.20%
Worst Quarter (1Q’20):
-23.41%

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.20%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.41%)
Performance Table Heading rr_PerformanceTableHeading AVERAGE TOTAL ANNUAL RETURN (for the periods ending December 31, 2021) Investor Shares
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown in the table 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 Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for the Investor Class and after-tax returns for other classes will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns shown in the table 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 the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt. After-tax returns are shown for the Investor Class and after-tax returns for other classes will vary.
Investor [Member] | FAM Dividend Focus Fund | Russell MidCap Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 22.58%
5 Years rr_AverageAnnualReturnYear05 15.10%
10 Years rr_AverageAnnualReturnYear10 14.91%
Investor [Member] | FAM Dividend Focus Fund | FAM Dividend Focus Fund Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMEX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.23% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 125
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 390
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 676
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,489
Annual Return 2012 rr_AnnualReturn2012 11.02%
Annual Return 2013 rr_AnnualReturn2013 29.79%
Annual Return 2014 rr_AnnualReturn2014 7.85%
Annual Return 2015 rr_AnnualReturn2015 (0.73%)
Annual Return 2016 rr_AnnualReturn2016 21.59%
Annual Return 2017 rr_AnnualReturn2017 12.64%
Annual Return 2018 rr_AnnualReturn2018 0.06%
Annual Return 2019 rr_AnnualReturn2019 32.56%
Annual Return 2020 rr_AnnualReturn2020 13.20%
Annual Return 2021 rr_AnnualReturn2021 25.57%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 25.57%
5 Years rr_AverageAnnualReturnYear05 16.26%
10 Years rr_AverageAnnualReturnYear10 14.82%
Investor [Member] | FAM Dividend Focus Fund | FAM Dividend Focus Fund Investor Class | Return after taxes on distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 25.18%
5 Years rr_AverageAnnualReturnYear05 15.78%
10 Years rr_AverageAnnualReturnYear10 13.62%
Investor [Member] | FAM Dividend Focus Fund | FAM Dividend Focus Fund Investor Class | Return after taxes on distributions and sale of fund shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 15.42%
5 Years rr_AverageAnnualReturnYear05 13.06%
10 Years rr_AverageAnnualReturnYear10 11.92%
Investor [Member] | FAM Small Cap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Small Cap Fund – Investor Shares SUMMARY SECTION    
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

FAM Small Cap Fund’s investment objective is to maximize long-term return on capital.

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

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

 
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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)
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 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 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”
Expense Example [Heading] rr_ExpenseExampleHeading Expense 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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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. The Example also includes the contractual arrangement permitting the Advisor to recover amounts waived or reimbursed by the Advisor during prior years. Although your actual costs may be higher or lower, based on these assumptions your costs would be:   Expense Example
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Fenimore Asset Management, Inc. (“Fenimore”), the investment advisor to the Fund, employs a “value approach” in making its common stock selections. This approach is based on Fenimore’s belief that at any given point in time the stock price of a company may sell below the company’s “true business worth”. Factors considered in evaluating the true business worth include the company’s current earnings, and Fenimore’s opinion as to its future potential. After identifying a company whose securities are determined to have a favorable price-to-earnings relationship, Fenimore plans to invest in such securities until the “true business worth” nears the market price of the company’s securities.

 

Under normal market conditions the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of small-cap companies. The Fund considers small-cap companies to be those issuers that, at the time of initial purchase, have a market capitalization that is within or below the range of companies in the Russell 2000 Index as of the latest reconstitution. As of May 7, 2021, the market capitalization range for the Russell 2000 Index was approximately $257.1 million to $7.3 billion.

 

The Fund may invest in securities of both domestic and foreign issuers and it may invest in shares of other investment companies, including exchange-traded funds (“ETFs”). The Fund’s policy of investing at least 80% of its net assets in small-cap companies may only be changed upon 60 days prior notice to shareholders.

 
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
●Small-Cap Risk - small capitalization companies may not have the size, resources or other assets of large capitalization companies.

 

●Stock Market Risk - the value of stocks fluctuates in response to the activities of individual companies and general stock market and economic conditions. Stock prices may decline over short or extended periods of time. Stocks are more volatile and riskier than some other forms of investments.

 

●Stock Selection Risk - the value stocks chosen for the Fund are subject to the risk that the market may never realize their intrinsic value or their prices may go down.

 

●Market Risk - the value of your investment will go up and down, which means that you could lose money. Market risk includes political, regulatory, economic, social and health risks (including the risks presented by the spread of infectious diseases) which can lead to increased market volatility and negative impacts on local and global financial markets, and the duration and severity of the impact of these risks on markets cannot be reasonably estimated.

 

●Foreign Investment Risk - the Fund may invest in securities of foreign issuers that are traded in foreign markets or may be represented by American Depository Receipts that are traded in the United States. Investments in non-U.S. securities may involve additional risk including exchange rate fluctuation, political or economic instability, the imposition of exchange controls, expropriation, limited disclosure and illiquid markets.

 

●Investment in Other Investment Companies Risk - the Fund may invest in shares of other investment companies, including ETFs. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests. In addition, shareholders will be exposed to the investment risks associated with investments in other investment companies.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Annual Total Return
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart shows the Investor Shares performance since 2013. The table shows the Investor Shares average annual returns (before and after taxes) for the one year period and five year period ended December 31, 2021 and since the Fund’s inception on March 1, 2012 compared to those of the Russell 2000 Index, the Fund’s primary benchmark. 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 may be obtained at the Fund’s website fenimoreasset.com.

 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart shows the Investor Shares performance since 2013. The table shows the Investor Shares average annual returns (before and after taxes) for the one year period and five year period ended December 31, 2021 and since the Fund’s inception on March 1, 2012 compared to those of the Russell 2000 Index, the Fund’s primary benchmark.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress fenimoreasset.com
Performance Past Does Not Indicate Future [Text] 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 FAM SMALL CAP FUND Investor Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter (4Q’20):
25.41%
Worst Quarter (1Q’20):
-30.29%

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.41%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (30.29%)
Performance Table Heading rr_PerformanceTableHeading AVERAGE TOTAL ANNUAL RETURN (for the periods ending December 31, 2021) Investor Shares
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes The after-tax returns shown in the table 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 Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns are shown for the Investor Class and after-tax returns for other classes will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns shown in the table 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 the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt. After-tax returns are shown for the Investor Class and after-tax returns for other classes will vary.
Investor [Member] | FAM Small Cap Fund | Russell 2000 Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 14.82%
5 Years rr_AverageAnnualReturnYear05 12.02%
Since Inception rr_AverageAnnualReturnSinceInception 12.35%
Investor [Member] | FAM Small Cap Fund | FAM Small Cap Fund Investor  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 129
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 403
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 697
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,534
Annual Return 2013 rr_AnnualReturn2013 40.49%
Annual Return 2014 rr_AnnualReturn2014 5.58%
Annual Return 2015 rr_AnnualReturn2015 (3.49%)
Annual Return 2016 rr_AnnualReturn2016 24.21%
Annual Return 2017 rr_AnnualReturn2017 4.55%
Annual Return 2018 rr_AnnualReturn2018 (9.37%)
Annual Return 2019 rr_AnnualReturn2019 26.89%
Annual Return 2020 rr_AnnualReturn2020 10.10%
Annual Return 2021 rr_AnnualReturn2021 27.72%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 27.72%
5 Years rr_AverageAnnualReturnYear05 11.07%
Since Inception rr_AverageAnnualReturnSinceInception 12.96%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Investor [Member] | FAM Small Cap Fund | FAM Small Cap Fund Investor | Return after taxes on distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 25.86%
5 Years rr_AverageAnnualReturnYear05 10.12%
Since Inception rr_AverageAnnualReturnSinceInception 12.14%
Investor [Member] | FAM Small Cap Fund | FAM Small Cap Fund Investor | Return after taxes on distributions and sale of fund shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 17.75%
5 Years rr_AverageAnnualReturnYear05 8.60%
Since Inception rr_AverageAnnualReturnSinceInception 10.58%
Institutional [Member] | FAM Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Value Fund – Institutional Shares SUMMARY SECTION    
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

FAM Value Fund’s investment objective is to maximize long-term return on capital.

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

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

 
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2023
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 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 6% of the average value of its portfolio.

 
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 6.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”
Expense Example [Heading] rr_ExpenseExampleHeading Expense 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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:   Expense Example
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Fenimore Asset Management, Inc. (“Fenimore”), the investment advisor to the Fund, employs a “value approach” in making its common stock selections. This approach is based on Fenimore’s belief that at any given point in time the stock price of a company may sell below the company’s “true business worth”. Factors considered in evaluating the true business worth include the company’s current earnings and Fenimore’s opinion as to its future earnings potential. After identifying a company whose securities are determined to have a favorable price-to-earnings relationship, Fenimore plans to invest in such securities until the “true business worth” nears the market price of the company’s securities.

 

Generally, the Fund will attempt to remain fully invested in common stocks and securities that are convertible into common stocks, such as convertible bonds and convertible preferred stocks. The Fund may invest in the securities of issuers of all sizes and market capitalizations. The Fund may also invest in the securities of both domestic and foreign issuers and it may invest in shares of other investment companies, including exchange-traded funds (“ETFs”).

 
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
●Stock Market Risk - the value of stocks fluctuates in response to the activities of individual companies and general stock market and economic conditions. Stock prices may decline over short or extended periods of time. Stocks are more volatile and riskier than some other forms of investments.

 

●Stock Selection Risk - the value stocks chosen for the Fund are subject to the risk that the market may never realize their intrinsic value or their prices may go down.

 

●Small-Cap Risk - small capitalization companies may not have the size, resources or other assets of large capitalization companies.

 

●Market Risk - the value of your investment will go up and down, which means that you could lose money. Market risk includes political, regulatory, economic, social and health risks (including the risks presented by the spread of infectious diseases) which can lead to increased market volatility and negative impacts on local and global financial markets, and the duration and severity of the impact of these risks on markets cannot be reasonably estimated.

 

●Foreign Investment Risk - the Fund may invest in securities of foreign issuers that are traded in foreign markets or may be represented by American Depository Receipts that are traded in the United States. Investments in non-U.S. securities may involve additional risk including exchange rate fluctuation, political or economic instability, the imposition of exchange controls, expropriation, limited disclosure and illiquid markets.

 

●Investment in Other Investment Companies Risk – the Fund may invest in shares of other investment companies, including ETFs. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests. In addition, shareholders will be exposed to the investment risks associated with investments in other investment companies.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Annual Total Return
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance results shown below for the periods prior to January 3, 2017, the date of commencement of operations of the Institutional Shares for the Fund, are for a class of shares of the Fund that are not offered in this Prospectus, Investor Shares, which are subject to higher fees as a result of differences in the shareholder administrative services fees and certain other fees paid by each class. Institutional Shares and Investor Shares would have substantially similar performance results because the shares of each class are invested in the same portfolio securities of the Fund. Because of the difference in the level of fees paid by Investor Shares, the returns for the Investor Shares will be lower than the returns for Institutional Shares. The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart and table show the Investor Shares performance for periods prior to January 3, 2017. The table shows the average annual returns (before and after taxes) for the one year, five year and ten year periods ended December 31, 2021 and compared to those of the Russell MidCap Index, the Fund’s primary benchmark. 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 may be obtained at the Fund’s website fenimoreasset.com.

 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table show the Investor Shares performance for periods prior to January 3, 2017. The table shows the average annual returns (before and after taxes) for the one year, five year and ten year periods ended December 31, 2021 and compared to those of the Russell MidCap Index, the Fund’s primary benchmark.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress fenimoreasset.com
Performance Past Does Not Indicate Future [Text] 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 FAM VALUE FUND Institutional Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter (2Q’20):
15.82%
Worst Quarter (1Q’20):
-23.69%

 

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.82%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.69%)
Performance Table Heading rr_PerformanceTableHeading AVERAGE TOTAL ANNUAL RETURN (for the periods ending December 31, 2021) Institutional Shares
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown in the table 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 Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for the Institutional Class and after-tax returns for other classes will vary
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns shown in the table 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 the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt. After-tax returns are shown for the Institutional Class and after-tax returns for other classes will vary.
Institutional [Member] | FAM Value Fund | Russell MidCap Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 22.58%
5 Years rr_AverageAnnualReturnYear05 15.10%
10 Years rr_AverageAnnualReturnYear10 14.91%
Institutional [Member] | FAM Value Fund | FAM Value Fund Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMWX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.12% [5],[6]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00% [5]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 344
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 605
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,352
Annual Return 2012 rr_AnnualReturn2012 11.39%
Annual Return 2013 rr_AnnualReturn2013 32.96%
Annual Return 2014 rr_AnnualReturn2014 13.41%
Annual Return 2015 rr_AnnualReturn2015 (1.74%)
Annual Return 2016 rr_AnnualReturn2016 15.60%
Annual Return 2017 rr_AnnualReturn2017 17.18%
Annual Return 2018 rr_AnnualReturn2018 (6.00%)
Annual Return 2019 rr_AnnualReturn2019 30.57%
Annual Return 2020 rr_AnnualReturn2020 7.03%
Annual Return 2021 rr_AnnualReturn2021 25.86%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 25.86%
5 Years rr_AverageAnnualReturnYear05 14.14%
10 Years rr_AverageAnnualReturnYear10 13.97%
Institutional [Member] | FAM Value Fund | FAM Value Fund Institutional Class | Return after taxes on distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 24.41%
5 Years rr_AverageAnnualReturnYear05 12.85%
10 Years rr_AverageAnnualReturnYear10 12.65%
Institutional [Member] | FAM Value Fund | FAM Value Fund Institutional Class | Return after taxes on distributions and sale of fund shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 16.35%
5 Years rr_AverageAnnualReturnYear05 11.11%
10 Years rr_AverageAnnualReturnYear10 11.34%
Institutional [Member] | FAM Dividend Focus Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Dividend Focus Fund – Institutional Shares SUMMARY SECTION    
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

FAM Dividend Focus Fund’s investment objective is to provide current income as well as long-term capital appreciation by investing primarily (at least 80% of its total assets) in income-producing stocks that pay dividends.

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

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

 
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2023
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 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 4% of the average value of its portfolio.

 
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 4.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates “Other Expenses” have been restated based on current contractual arrangements and are estimated for the current fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the Prospectus, which does not include “Acquired Fund Fees and Expenses.”
Expense Example [Heading] rr_ExpenseExampleHeading Expense 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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:   Expense Example
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Fenimore Asset Management, Inc. (“Fenimore”), the investment advisor to the Fund employs a “value approach” in making its common stock selections. This approach is based on Fenimore’s belief that at any given point in time the stock price of a company may sell below the company’s “true business worth”. Factors considered in evaluating the true business worth include the company’s current earnings and Fenimore’s opinion as to its future earnings potential. After identifying a company whose securities are determined to have a favorable price-to-earnings relationship, Fenimore plans to invest in such securities until the “true business worth” nears the market price of the company’s securities.

Generally, the Fund will attempt to remain fully invested in common stocks and securities that are convertible into common stocks, such as convertible bonds and convertible preferred stocks. The Fund may invest in the securities of issuers of all sizes and market capitalizations. The Fund may also invest in the securities of both domestic and foreign issuers and it may invest in shares of other investment companies, including exchange-traded funds (“ETFs”).

 
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
●Stock Market Risk - the value of stocks fluctuates in response to the activities of individual companies and general stock market and economic conditions. Stock prices may decline over short or extended periods of time. Stocks are more volatile and riskier than some other forms of investments.

 

●Stock Selection Risk - the value stocks chosen for the Fund are subject to the risk that the market may never realize their intrinsic value or their prices may go down.

 

●Small-Cap Risk - small capitalization companies may not have the size, resources or other assets of large capitalization companies.

 

●Market Risk - the value of your investment will go up and down, which means that you could lose money. Market risk includes political, regulatory, economic, social and health risks (including the risks presented by the spread of infectious diseases) which can lead to increased market volatility and negative impacts on local and global financial markets, and the duration and severity of the impact of these risks on markets cannot be reasonably estimated.

 

●Foreign Investment Risk - the Fund may invest in securities of foreign issuers that are traded in foreign markets or may be represented by American Depository Receipts that are traded in the United States. Investments in non-U.S. securities may involve additional risk including exchange rate fluctuation, political or economic instability, the imposition of exchange controls, expropriation, limited disclosure and illiquid markets.

 

●Investment in Other Investment Companies Risk – the Fund may invest in shares of other investment companies, including ETFs. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests. In addition, shareholders will be exposed to the investment risks associated with investments in other investment companies.

 
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Annual Total Return
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The Institutional Shares of the Fund have not yet commenced operations and therefore do not yet have their own performance history. The performance results shown are for the Investor shares which are not offered in this Prospectus. Investor Shares are subject to higher fees because of differences in the shareholder administrative services fees and certain other fees paid by each class. Institutional Shares and Investor Shares would have substantially similar performance results because the shares of each class are invested in the same portfolio securities of the Fund. Because of the difference in the level of fees paid by Investor Shares, the returns for the Investor Shares will be lower than the returns for Institutional Shares. The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart shows changes in the Investor Shares performance from year to year. The table shows the Investor Shares average annual returns (before and after taxes) compared to those of the Russell MidCap Index, the Fund’s primary benchmark index. 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 may be obtained at the Fund’s website fenimoreasset.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart shows changes in the Investor Shares performance from year to year. The table shows the Investor Shares average annual returns (before and after taxes) compared to those of the Russell MidCap Index, the Fund’s primary benchmark index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress fenimoreasset.com
Performance Past Does Not Indicate Future [Text] 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 FAM DIVIDEND FOCUS FUND Institutional Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter (2Q 2020):
19.20%
Worst Quarter (1Q 2020):
-23.41%

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.20%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.41%)
Performance Table Heading rr_PerformanceTableHeading AVERAGE TOTAL ANNUAL RETURN (for the periods ending December 31, 2021) Institutional Shares
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown in the table 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 Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for the Investor Class and after-tax returns for other classes will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns shown in the table 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 the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt. After-tax returns are shown for the Investor Class and after-tax returns for other classes will vary.
Institutional [Member] | FAM Dividend Focus Fund | Russell 2000 Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 22.58%
5 Years rr_AverageAnnualReturnYear05 15.10%
10 Years rr_AverageAnnualReturnYear10 14.91%
Institutional [Member] | FAM Dividend Focus Fund | FAM Dividend Focus Fund Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32% [7]
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.23% [8],[9]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.11% [8]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 113
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 664
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,478
Annual Return 2012 rr_AnnualReturn2012 11.02%
Annual Return 2013 rr_AnnualReturn2013 29.79%
Annual Return 2014 rr_AnnualReturn2014 7.85%
Annual Return 2015 rr_AnnualReturn2015 (0.73%)
Annual Return 2016 rr_AnnualReturn2016 21.59%
Annual Return 2017 rr_AnnualReturn2017 12.64%
Annual Return 2018 rr_AnnualReturn2018 0.06%
Annual Return 2019 rr_AnnualReturn2019 32.56%
Annual Return 2020 rr_AnnualReturn2020 13.20%
Annual Return 2021 rr_AnnualReturn2021 25.57%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 25.57%
5 Years rr_AverageAnnualReturnYear05 16.26%
10 Years rr_AverageAnnualReturnYear10 14.82%
Institutional [Member] | FAM Dividend Focus Fund | FAM Dividend Focus Fund Institutional Class | Return after taxes on distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 25.18%
5 Years rr_AverageAnnualReturnYear05 15.78%
10 Years rr_AverageAnnualReturnYear10 13.62%
Institutional [Member] | FAM Dividend Focus Fund | FAM Dividend Focus Fund Institutional Class | Return after taxes on distributions and sale of fund shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 15.42%
5 Years rr_AverageAnnualReturnYear05 13.06%
10 Years rr_AverageAnnualReturnYear10 11.92%
Institutional [Member] | FAM Small Cap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Small Cap Fund – Institutional Shares SUMMARY SECTION    
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

FAM Small Cap Fund’s investment objective is to maximize long-term return on capital.

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

The tables below describe the fees and expenses that you may pay if you buy and hold shares of the Fund.

 
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
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)
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 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 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”
Expense Example [Heading] rr_ExpenseExampleHeading Expense 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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:   Expense Example
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Fenimore Asset Management, Inc. (“Fenimore”), the investment advisor to the Fund, employs a “value approach” in making its common stock selections. This approach is based on Fenimore’s belief that at any given point in time the stock price of a company may sell below the company’s “true business worth”. Factors considered in evaluating the true business worth include the company’s current earnings, and Fenimore’s opinion as to its future potential. After identifying a company whose securities are determined to have a favorable price-to-earnings relationship, Fenimore plans to invest in such securities until the “true business worth” nears the market price of the company’s securities.

 

Under normal market conditions the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of small-cap companies. The Fund considers small-cap companies to be those issuers that, at the time of initial purchase, have a market capitalization that is within or below the range of companies in the Russell 2000 Index as of the latest reconstitution. As of May 7, 2021, the market capitalization range for the Russell 2000 Index was approximately $257.1 million to $7.3 billion.

 

The Fund may invest in securities of both domestic and foreign issuers and it may invest in shares of other investment companies, including exchange-traded funds (“ETFs”). The Fund’s policy of investing at least 80% of its net assets in small-cap companies may only be changed upon 60 days prior notice to shareholders.

 
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
●Small-Cap Risk - small capitalization companies may not have the size, resources or other assets of large capitalization companies.

 

●Stock Market Risk - the value of stocks fluctuates in response to the activities of individual companies and general stock market and economic conditions. Stock prices may decline over short or extended periods of time. Stocks are more volatile and riskier than some other forms of investments.

 

●Stock Selection Risk - the value stocks chosen for the Fund are subject to the risk that the market may never realize their intrinsic value or their prices may go down.

 

●Market Risk - the value of your investment will go up and down, which means that you could lose money. Market risk includes political, regulatory, economic, social and health risks (including the risks presented by the spread of infectious diseases) which can lead to increased market volatility and negative impacts on local and global financial markets, and the duration and severity of the impact of these risks on markets cannot be reasonably estimated.

 

●Foreign Investment Risk – the Fund may invest in securities of foreign issuers that are traded in foreign markets or may be represented by American Depository Receipts that are traded in the United States. Investments in non-U.S. securities may involve additional risk including exchange rate fluctuation, political or economic instability, the imposition of exchange controls, expropriation, limited disclosure and illiquid markets.

 

●Investment in Other Investment Companies Risk – the Fund may invest in shares of other investment companies, including ETFs. Shareholders of the Fund will indirectly be subject to the fees and expenses of the other investment companies in which the Fund invests. In addition, shareholders will be exposed to the investment risks associated with investments in other investment companies.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Annual Total Return
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The performance results shown below for the periods prior to January 1, 2016, the date of commencement of operations of the Institutional Shares for the Fund, are for a class of shares of the Fund that are not offered in this Prospectus, Investor Shares, which are subject to higher fees as a result of differences in the shareholder administrative services fees and certain other fees paid by each class. Institutional Shares and Investor Shares would have substantially similar performance results because the shares of each class are invested in the same portfolio securities of the Fund. Because of the difference in the level of fees paid by Investor Shares, the returns for the Investor Shares will be lower than the returns for Institutional Shares. The following bar chart and table show some indication of the risks of investing in the Fund. The bar chart and table show the Investor Shares performance for periods prior to January 1, 2016. The table shows the average annual returns (before and after taxes) for the 1-year, 5-year and since inception periods ended December 31, 2021 and compared to those of the Russell 2000 Index, the Fund’s primary benchmark. 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 may be obtained at the Fund’s website fenimoreasset.com. 

 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table show the Investor Shares performance for periods prior to January 1, 2016. The table shows the average annual returns (before and after taxes) for the 1-year, 5-year and since inception periods ended December 31, 2021 and compared to those of the Russell 2000 Index, the Fund’s primary benchmark.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress fenimoreasset.com
Performance Past Does Not Indicate Future [Text] 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 FAM SMALL CAP FUND Institutional Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter (4Q 2020):
25.49%
Worst Quarter (1Q 2020):
-30.28%

  
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.49%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (30.28%)
Performance Table Heading rr_PerformanceTableHeading AVERAGE TOTAL ANNUAL RETURN (for the periods ending December 31, 2021) Institutional Shares
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns shown in the table 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 Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for the Institutional Class and after-tax returns for other classes will vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The after-tax returns shown in the table 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 the investor’s tax situation and may differ from those shown. The 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, or to investors who are tax exempt. After-tax returns are shown for the Institutional Class and after-tax returns for other classes will vary.
Institutional [Member] | FAM Small Cap Fund | Russell 2000 Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 14.82%
5 Years rr_AverageAnnualReturnYear05 12.02%
Since Inception rr_AverageAnnualReturnSinceInception 12.35%
Institutional [Member] | FAM Small Cap Fund | FAM Small Cap Fund Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMDX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.25%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.16% [10]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 368
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 638
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,409
Annual Return 2013 rr_AnnualReturn2013 40.49%
Annual Return 2014 rr_AnnualReturn2014 5.58%
Annual Return 2015 rr_AnnualReturn2015 (3.49%)
Annual Return 2016 rr_AnnualReturn2016 24.42%
Annual Return 2017 rr_AnnualReturn2017 4.66%
Annual Return 2018 rr_AnnualReturn2018 (9.29%)
Annual Return 2019 rr_AnnualReturn2019 27.05%
Annual Return 2020 rr_AnnualReturn2020 10.25%
Annual Return 2021 rr_AnnualReturn2021 27.82%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 27.82%
5 Years rr_AverageAnnualReturnYear05 11.19%
Since Inception rr_AverageAnnualReturnSinceInception 13.04%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Institutional [Member] | FAM Small Cap Fund | FAM Small Cap Fund Institutional Class | Return after taxes on distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 25.97%
5 Years rr_AverageAnnualReturnYear05 10.24%
Since Inception rr_AverageAnnualReturnSinceInception 12.22%
Institutional [Member] | FAM Small Cap Fund | FAM Small Cap Fund Institutional Class | Return after taxes on distributions and sale of fund shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 17.80%
5 Years rr_AverageAnnualReturnYear05 8.70%
Since Inception rr_AverageAnnualReturnSinceInception 10.65%
[1] The Advisor has contractually agreed, until May 1, 2023, to waive fees and/or reimburse the Fund certain expenses (excluding interest, taxes, brokerage costs, Acquired Fund Fees and Expenses, dividend expense and extraordinary expenses) to the extent necessary to maintain Net Fund Operating Expenses for Investor Shares at 1.18%. The Fund has agreed to repay the Advisor for amounts waived or reimbursed by the Advisor pursuant to the Expense Limitation Agreement provided that such repayment does not cause the Net Fund Operating Expenses for Investor Shares to exceed the above limit and the repayment is made within three years after the year in which the Advisor incurred the expense. This Expense Limitation Agreement may only be amended or terminated by the Fund’s Board of Trustees. During the Fund’s most recently completed fiscal year, the net fee waivers with respect to Investor Shares, after the repayment of applicable expense reimbursements, were less than 0.01%.
[2] The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”
[3] The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”
[4] The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”
[5] The Advisor has contractually agreed, until May 1, 2023, to waive fees and/or reimburse the Fund certain expenses (excluding interest, taxes, brokerage costs, Acquired Fund Fees and Expenses, dividend expense and extraordinary expenses) to the extent necessary to maintain Net Fund Operating Expenses for Institutional Shares at 0.99%. The Fund has agreed to repay the Advisor for amounts waived or reimbursed by the Advisor pursuant to the Expense Limitation Agreement provided that such repayment does not cause the Net Fund Operating Expenses for Institutional Shares to exceed the above limit and the repayment is made within three years after the year in which the Advisor incurred the expense. This Expense Limitation Agreement may only be amended or terminated by the Fund’s Board of Trustees.
[6] The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”
[7] “Other Expenses” have been restated based on current contractual arrangements and are estimated for the current fiscal year.
[8] As of the date of this Prospectus, the Institutional Class of the FAM Dividend Focus Fund has not commenced operations. Prior to the Institutional Class commencing operations, the Advisor contractually agreed, until May 1, 2023, to waive fees and/or reimburse the Fund certain expenses (excluding interest, taxes, brokerage costs, Acquired Fund Fees and Expenses, dividend expense and extraordinary expenses) to the extent necessary to maintain Net Fund Operating Expenses for Institutional Shares at 1.10%. The Fund has agreed to repay the Advisor for amounts waived or reimbursed by the Advisor pursuant to the Expense Limitation Agreement provided that such repayment does not cause the Net Fund Operating Expenses for Institutional Shares to exceed the above limit and the repayment is made within three years after the year in which the Advisor incurred the expense. This Expense Limitation Agreement may only be amended or terminated by the Fund’s Board of Trustees.
[9] The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the Prospectus, which does not include “Acquired Fund Fees and Expenses.”
[10] The “Total Fund Operating Expenses” shown may not correlate to the Fund’s ratios of expenses to average net assets shown in the “Financial Highlights” section of the prospectus, which does not include “Acquired Fund Fees and Expenses.”