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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, 2018
Entity Registrant Name dei_EntityRegistrantName FENIMORE ASSET MANAGEMENT TRUST
Entity Central Index Key dei_EntityCentralIndexKey 0000797136
Amendment Flag dei_AmendmentFlag false
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Document Creation Date dei_DocumentCreationDate May 01, 2019
Document Effective Date dei_DocumentEffectiveDate May 01, 2019
Prospectus Date rr_ProspectusDate May 01, 2019
Investor Shares | FAM Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Value Fund - Investor Shares Summary Section
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Investment Objective: FAM Value Fund's investment objective is to maximize long-term return on capital. Fees and Expenses of the Fund: 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, 2020
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

Portfolio Turnover: 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 12% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 12.00%
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 Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Expense Example: 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption EXPENSE EXAMPLE
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal Investment Strategies: 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.

 

  • 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.
Risk Lose Money [Text] rr_RiskLoseMoney the value of your investment will go up and down, which means that you could lose money.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Annual Total Return: 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 2009. 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 www.famfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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 www.famfunds.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'09 15.78%
Worst Quarter 3Q'11 -17.89%
Performance Table Heading rr_PerformanceTableHeading AVERAGE TOTAL ANNUAL RETURN (for the periods ending December 31, 2018)
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 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 Shares | FAM Value Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMVX
Maximum sales charge (load) on purchase rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Fund Operating Expenses rr_ExpensesOverAssets 1.20% [1],[2]
Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Net Fund Operating Expenses rr_NetExpensesOverAssets 1.19% [2]
One Year rr_ExpenseExampleYear01 $ 121
Three Years rr_ExpenseExampleYear03 380
Five Years rr_ExpenseExampleYear05 659
Ten Years rr_ExpenseExampleYear10 $ 1,454
Annual Return 2009 rr_AnnualReturn2009 22.18%
Annual Return 2010 rr_AnnualReturn2010 17.02%
Annual Return 2011 rr_AnnualReturn2011 (0.41%)
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%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.78%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.89%)
1 Year rr_AverageAnnualReturnYear01 (6.18%)
5 Years rr_AverageAnnualReturnYear05 7.18%
10 Years rr_AverageAnnualReturnYear10 11.55%
Investor Shares | FAM Value Fund | After Taxes on Distributions | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (7.07%)
5 Years rr_AverageAnnualReturnYear05 5.80%
10 Years rr_AverageAnnualReturnYear10 10.62%
Investor Shares | FAM Value Fund | After Taxes on Distributions and Sales | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (3.04%)
5 Years rr_AverageAnnualReturnYear05 5.53%
10 Years rr_AverageAnnualReturnYear10 9.53%
Investor Shares | FAM Value Fund | Russell MidCap Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (9.06%)
5 Years rr_AverageAnnualReturnYear05 6.26%
10 Years rr_AverageAnnualReturnYear10 14.03%
Investor Shares | FAM Equity-Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Equity-Income Fund - Investor Shares Summary Section
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Investment Objective: FAM Equity-Income 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 Narrative [Text Block] rr_ExpenseNarrativeTextBlock

Fees and Expenses of the Fund: 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 [Text Block] rr_PortfolioTurnoverTextBlock

Portfolio Turnover: 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 18% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 18.00%
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 Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Expense Example: 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption EXPENSE EXAMPLE
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal Investment Strategies: 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.

 

  • 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.
Risk Lose Money [Text] rr_RiskLoseMoney the value of your investment will go up and down, which means that you could lose money.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Annual Total Return: 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 2009. 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 www.famfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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 www.famfunds.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 Equity-Income Fund Investor Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter 2Q'09 16.68%
Worst Quarter 3Q'11 -13.51%
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURN (for the periods ending December 31, 2018)
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 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 Shares | FAM Equity-Income Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMEX
Maximum sales charge (load) on purchase rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Fund Operating Expenses rr_ExpensesOverAssets 1.24% [1]
One Year rr_ExpenseExampleYear01 $ 126
Three Years rr_ExpenseExampleYear03 393
Five Years rr_ExpenseExampleYear05 681
Ten Years rr_ExpenseExampleYear10 $ 1,500
Annual Return 2009 rr_AnnualReturn2009 21.43%
Annual Return 2010 rr_AnnualReturn2010 17.47%
Annual Return 2011 rr_AnnualReturn2011 6.79%
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%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.68%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.51%)
1 Year rr_AverageAnnualReturnYear01 0.06%
5 Years rr_AverageAnnualReturnYear05 7.97%
10 Years rr_AverageAnnualReturnYear10 12.41%
Investor Shares | FAM Equity-Income Fund | After Taxes on Distributions | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (0.26%)
5 Years rr_AverageAnnualReturnYear05 6.73%
10 Years rr_AverageAnnualReturnYear10 11.22%
Investor Shares | FAM Equity-Income Fund | After Taxes on Distributions and Sales | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 0.26%
5 Years rr_AverageAnnualReturnYear05 5.90%
10 Years rr_AverageAnnualReturnYear10 9.92%
Investor Shares | FAM Equity-Income Fund | Russell MidCap Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (9.06%)
5 Years rr_AverageAnnualReturnYear05 6.26%
10 Years rr_AverageAnnualReturnYear10 14.03%
Investor Shares | FAM Small Cap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Small Cap Fund - Investor Shares Summary Section
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Investment Objective: FAM Small Cap Fund's investment objective is to maximize long-term return on capital.
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

Fees and Expenses of the Fund: 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, 2020
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

Portfolio Turnover: 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 31% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 31.00%
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 Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Expense Example: 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. 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 by, Year, Caption [Text] rr_ExpenseExampleByYearCaption EXPENSE EXAMPLE
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal Investment Strategies: 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 cur- rent 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 11, 2018, the market capitalization range for the Russell 2000 Index was approximately $159.2 million to $5.0 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.

 

  • 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.
Risk Lose Money [Text] rr_RiskLoseMoney the value of your investment will go up and down, which means that you could lose money.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Annual Total Return: 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, 2018 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 www.famfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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, 2018 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 www.famfunds.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'14 12.35%
Worst Quarter 4Q'18 -17.23%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns 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 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 Shares | FAM Small Cap Fund | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMFX
Maximum sales charge (load) on purchase rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.37%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Fund Operating Expenses rr_ExpensesOverAssets 1.28% [1],[3]
Fee Recoupment fam_FeeRecoupment 0.01% [3]
Net Fund Operating Expenses rr_NetExpensesOverAssets 1.29% [3]
One Year rr_ExpenseExampleYear01 $ 131
Three Years rr_ExpenseExampleYear03 407
Five Years rr_ExpenseExampleYear05 703
Ten Years rr_ExpenseExampleYear10 $ 1,546
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%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.35%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.23%)
1 Year rr_AverageAnnualReturnYear01 (9.37%)
5 Years rr_AverageAnnualReturnYear05 3.70%
Since Inception rr_AverageAnnualReturnSinceInception 9.49%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Investor Shares | FAM Small Cap Fund | After Taxes on Distributions | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (11.36%)
5 Years rr_AverageAnnualReturnYear05 2.83%
Since Inception rr_AverageAnnualReturnSinceInception 8.59%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Investor Shares | FAM Small Cap Fund | After Taxes on Distributions and Sales | Investor Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (4.17%)
5 Years rr_AverageAnnualReturnYear05 2.79%
Since Inception rr_AverageAnnualReturnSinceInception 7.51%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Investor Shares | FAM Small Cap Fund | Russell 2000 Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (11.01%)
5 Years rr_AverageAnnualReturnYear05 4.41%
Since Inception rr_AverageAnnualReturnSinceInception 9.14%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Institutional Shares | FAM Value Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Value Fund - Institutional Shares Summary Section
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Investment Objective: FAM Value Fund's investment objective is to maximize long-term return on capital. Fees and Expenses of the Fund: 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, 2020
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

Portfolio Turnover: 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 12% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 12.00%
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 Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Expense Example: 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption EXPENSE EXAMPLE
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal Investment Strategies: 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.

 

  • 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.
Risk Lose Money [Text] rr_RiskLoseMoney the value of your investment will go up and down, which means that you could lose money.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Annual Total Return: 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, 2018 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 famfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The table shows the average annual returns (before and after taxes) for the one year, five year and ten year periods ended December 31, 2018 and compared to those of the Russell MidCap Index, the Fund's primary benchmark.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress famfunds.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'09 15.78%
Worst Quarter 3Q'11 -17.89%
Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURN (for the periods ending December 31, 2018)
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 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 Shares | FAM Value Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMWX
Maximum sales charge (load) on purchase rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.20%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Fund Operating Expenses rr_ExpensesOverAssets 1.11% [1],[4]
Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [4]
Net Fund Operating Expenses rr_NetExpensesOverAssets 1.00% [4]
One Year rr_ExpenseExampleYear01 $ 102
Three Years rr_ExpenseExampleYear03 342
Five Years rr_ExpenseExampleYear05 601
Ten Years rr_ExpenseExampleYear10 $ 1,342
Annual Return 2009 rr_AnnualReturn2009 22.18%
Annual Return 2010 rr_AnnualReturn2010 17.02%
Annual Return 2011 rr_AnnualReturn2011 (0.41%)
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%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.78%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.89%)
1 Year rr_AverageAnnualReturnYear01 (6.00%)
5 Years rr_AverageAnnualReturnYear05 7.25%
10 Years rr_AverageAnnualReturnYear10 11.59%
Institutional Shares | FAM Value Fund | After Taxes on Distributions | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (6.92%)
5 Years rr_AverageAnnualReturnYear05 5.87%
10 Years rr_AverageAnnualReturnYear10 10.65%
Institutional Shares | FAM Value Fund | After Taxes on Distributions and Sales | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (2.90%)
5 Years rr_AverageAnnualReturnYear05 5.58%
10 Years rr_AverageAnnualReturnYear10 9.56%
Institutional Shares | FAM Value Fund | Russell MidCap Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (9.06%)
5 Years rr_AverageAnnualReturnYear05 6.26%
10 Years rr_AverageAnnualReturnYear10 14.03%
Institutional Shares | FAM Small Cap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FAM Small Cap Fund - Institutional Shares Summary Section
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Investment Objective: FAM Small Cap Fund's investment objective is to maximize long-term return on capital.
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

Fees and Expenses of the Fund: 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, 2020
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

Portfolio Turnover: 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 31% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 31.00%
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 Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Expense Example: 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption EXPENSE EXAMPLE
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal Investment Strategies: 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 cur- rent 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 11, 2018, the market capitalization range for the Russell 2000 Index was approximately $159.2 million to $5.0 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.

 

  • 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.
Risk Lose Money [Text] rr_RiskLoseMoney the value of your investment will go up and down, which means that you could lose money.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Annual Total Return:  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, 2018 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 famfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The table shows the average annual returns (before and after taxes) for the 1-year, 5-year and since inception periods ended December 31, 2018 and compared to those of the Russell 2000 Index, the Fund's primary benchmark.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress famfunds.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'14 12.35%
Worst Quarter 4Q'18 -17.27%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns 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 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 Shares | FAM Small Cap Fund | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FAMDX
Maximum sales charge (load) on purchase rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Fund Operating Expenses rr_ExpensesOverAssets 1.17% [1],[5]
Net Fund Operating Expenses rr_NetExpensesOverAssets 1.18% [5]
Fee Waiver/Expense Reimbursement fam_FeeWaiverExpenseReimbursement 0.01%
One Year rr_ExpenseExampleYear01 $ 120
Three Years rr_ExpenseExampleYear03 373
Five Years rr_ExpenseExampleYear05 645
Ten Years rr_ExpenseExampleYear10 $ 1,421
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%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.35%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.27%)
1 Year rr_AverageAnnualReturnYear01 (9.29%)
5 Years rr_AverageAnnualReturnYear05 3.77%
Since Inception rr_AverageAnnualReturnSinceInception 9.55%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Institutional Shares | FAM Small Cap Fund | After Taxes on Distributions | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (11.28%)
5 Years rr_AverageAnnualReturnYear05 2.90%
Since Inception rr_AverageAnnualReturnSinceInception 8.65%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Institutional Shares | FAM Small Cap Fund | After Taxes on Distributions and Sales | Institutional Shares  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (4.12%)
5 Years rr_AverageAnnualReturnYear05 2.85%
Since Inception rr_AverageAnnualReturnSinceInception 7.55%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Institutional Shares | FAM Small Cap Fund | Russell 2000 Index  
Prospectus [Line Items] rr_ProspectusLineItems  
1 Year rr_AverageAnnualReturnYear01 (11.01%)
5 Years rr_AverageAnnualReturnYear05 4.41%
Since Inception rr_AverageAnnualReturnSinceInception 9.14%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
[1] 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."
[2] The Advisor has contractually agreed, until May 1, 2020, 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.
[3] The Advisor has contractually agreed, until May 1, 2020, 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 1.42%. 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 fiscal year ended December 31, 2018, the Advisor recouped certain previously waived fees and expenses.
[4] The Advisor has contractually agreed, until May 1, 2020, 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.
[5] The Advisor has contractually agreed, until May 1, 2020, 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 1.20%. 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.