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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FENIMORE ASSET MANAGEMENT TRUST
Prospectus Date rr_ProspectusDate Mar. 01, 2012
Investor | FAM Small Cap Fund | Investor Class
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchase rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOther none
Redemption fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 1.50% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 2.50%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 1.00% [2]
Total Annual Fund Operating Expenses after Waiver and/or Reimbursement rr_NetExpensesOverAssets 1.50% [2]
1 YEAR rr_ExpenseExampleYear01 153
3 YEARS rr_ExpenseExampleYear03 474
Investor | 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

A N N UA L F U N D O P ER 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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2015
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. The fund has no portfolio turnover rate to date because it has not yet started to operate.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Based on estimated amounts for the Fund's initial fiscal year of operations
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 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

E X P E N S E E X A M P L E
Strategy [Heading] rr_StrategyHeading

Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

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 having market capitalizations of between $50 million and $1 billion, measured at the time of purchase. 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.

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, cash ow 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 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.
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 securities.  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.

• MarketRisk - 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.
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 securities.  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

Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The inception date for the Fund is March 1, 2012.  The Fund's performance will then be compared to the Russell 2000 Index.  Updated performance information may be obtained at the Fund's website www.famfunds.com.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The inception date for the Fund is March 1, 2012.  The Fund's performance will then be compared to the Russell 2000 Index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.famfunds.com
[1] Based on estimated amounts for the Fund's initial fiscal year of operations.
[2] Fenimore Asset Management (FAM) has entered into a contractual agreement with FAM Small Cap Fund to limit the total operating expenses of the Fund's Investor Class shares to 1.50% of its average daily net assets through May 1, 2015. This expense limitation agreement may only be amended by the Fund's Board of Trustees.