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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FENIMORE ASSET MANAGEMENT TRUST
Prospectus Date rr_ProspectusDate Jan. 01, 2016
Investor Shares [Member] | FAM Small Cap Fund | Investor  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 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 0.48% [1]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.38%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 140
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 437
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 755
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,657
Annual Return 2013 rr_AnnualReturn2013 40.49%
Annual Return 2014 rr_AnnualReturn2014 5.58%
Year to Date Return, Label rr_YearToDateReturnLabel Year-To-Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2015
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.39%
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 Mar. 31, 2014
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (0.27%)
1 Year rr_AverageAnnualReturnYear01 5.58%
Since Inception rr_AverageAnnualReturnSinceInception 18.96%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 01, 2012
Investor Shares [Member] | FAM Small Cap Fund | Investor | after taxes on distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.63%
Since Inception rr_AverageAnnualReturnSinceInception 18.20%
Investor Shares [Member] | FAM Small Cap Fund | Investor | after taxes on distributions and sale of fund shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.15%
Since Inception rr_AverageAnnualReturnSinceInception 11.64%
Investor Shares [Member] | FAM Small Cap Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

FAM Small Cap Fund
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

S H A R E H O L D E R   F E E S

(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

AN N UA L F U N D O P E R AT I N G E X P E N S E S

(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 securi-ties (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 13.40% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.40%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent

"Other Expenses" have been restated based on current contractual arrangements and are estimated for the

current fiscal year.
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. 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 as-sumes 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 [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 cur rent earnings, cash flow and/or book value, and Fenimore's opinion as to its future potential. After identifying a company whose securities are determined to have a favorable valuation, 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 com-panies 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 31, 2015, the market capitalization range for the Russell 2000 Index was approximately $177 million to $4.3 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 smallcap 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.

• Non-diversification Risk – the Fund is classified as a "non-diversified" fund which means that the Fund may own larger positions in a smaller number of issuers. A fund that is less diversified, such as the Fund, may be more susceptible to adverse economic, political, or regulatory developments affecting a single issuer than a fund that is more broadly diversified.

• Stock Market Risk - the value of stocks fluctuate 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.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus

• Non-diversification Risk – the Fund is classified as a "non-diversified" fund which means that the Fund may own larger positions in a smaller number of issuers. A fund that is less diversified, such as the Fund, may be more susceptible to adverse economic, political, or regulatory developments affecting a single issuer than a fund that is more broadly diversified.
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  for 2013  and  2014.   The  table shows  the  Investor Shares average  annual  returns  (before  and  after  taxes)  for  the  one  year  period  ended  December 31, 2014 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 famfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns
The bar  chart  shows  the  Investor Shares  performance  for 2013  and  2014.   The  table shows  the  Investor Shares average  annual  returns  (before  and  after  taxes)  for  the  one  year  period  ended  December 31, 2014 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 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 Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter (ended 12/31/14):

12.35%

 

Worst Quarter (ended 3/31/14):

-0.27%

The year-to-date return for the Fund's Investor Shares as of September 30, 2015 was 0.39%.
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns
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 Narrative rr_PerformanceTableNarrativeTextBlock

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.
Investor Shares [Member] | FAM Small Cap Fund | Russell 2000  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.58%
Since Inception rr_AverageAnnualReturnSinceInception 16.37%
[1] "Other Expenses" have been restated based on current contractual arrangements and are estimated for the current fiscal year.