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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Buffalo Dividend Focus Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment objective of the Buffalo Dividend Focus Fund (the “Dividend Focus Fund” or the “Fund”) is current income,
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock
with long-term growth of capital as a secondary objective.
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
Shareholder Fees Caption [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 77% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 77.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses for the Fund do not correlate to the ratio of expenses to average net assets listed in the Fund's financial highlights, which reflects the operating expenses of the Fund and does not include the amount of the Fund's proportionate share of the fees and expenses of other investment companies in which the Fund invests.
Expense Example [Heading] rr_ExpenseExampleHeading 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 assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
To pursue its investment objective, the Fund invests in dividend-paying equity securities, consisting of domestic common stocks, preferred stocks, rights, warrants and convertible securities.  During normal market conditions, at least 80% of the Fund’s assets will be invested in dividend-paying equity securities.  The Fund considers “dividend-paying equity securities” to be securities of companies that declare and pay cash dividends on at least an annual basis.  The Dividend Focus Fund may invest in companies in any sector and of any size of market capitalization; provided, however, that the Advisor believes that an investment in the company’s securities is consistent with the Fund’s investment objectives.  While the Fund may invest in securities of companies of any size, the Advisor expects that the majority of common stocks purchased for the Fund will be of large-cap companies.  The Fund considers large-cap companies to be those with market capitalizations in excess of $10 billion at the time of initial purchase.  In addition to investments in domestic securities, the Fund may invest up to 20% of its net assets in sponsored or unsponsored ADRs and securities of foreign companies that are traded on U.S. stock exchanges.

The Advisor emphasizes dividend-paying securities that have exhibited historical growth of dividends.  The Advisor may sell the Fund’s investments to secure gains, limit losses or reinvest in more promising investment opportunities.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The Fund cannot guarantee that it will achieve its investment objectives.  As with any mutual fund, the value of the Fund’s investments may fluctuate.  If the value of the Fund’s investments decreases, the value of the Fund’s shares will also decrease and you may lose money.  The risks associated with the Dividend Focus Fund’s principal investment strategies are:

Market Risk – The value of the Fund’s shares will fluctuate as a result of the movement of the overall stock market and/or bond market or of the value of the individual securities held by the Fund, and you could lose money.

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

Equity Market Risk – Equity securities held by the Fund may experience sudden, unpredictable drops in value or long periods of decline in value due to general stock market fluctuations, decisions by management or other factors.

Common Stocks.  Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value as market confidence in and perceptions of their issuers change.  Common stock is generally subject to greater risk than preferred stocks and debt obligations because holders of common stock generally have inferior rights to receive payments from issuers in comparison with the rights of the holders of other securities, bondholders and other creditors.

Preferred Stock.  Preferred stock is subject to the risk that the dividend on the stock may be changed or omitted by the issuer, and that participation in the growth of an issuer may be limited.

Convertible Securities.  A convertible security is a fixed-income security (a debt instrument or a preferred stock) which may be converted at a stated price within a specified period of time into a certain quantity of the common stock of the same or a different issuer. The market value of a convertible security performs like that of a regular debt security, that is, if market interest rates rise, the value of the convertible security falls.

Warrants.  Investments in warrants involve certain risks, including the possible lack of a liquid market for resale of the warrants, potential price fluctuations as a result of speculation or other factors, and failure of the price of the underlying security to reach or have reasonable prospects of reaching a level at which the warrant can be prudently exercised (in which event the warrant may expire without being exercised, resulting in a loss of the Fund’s entire investment therein).

Rights.  The purchase of rights involves the risk that the Fund could lose the purchase value of a right if the right is not exercised prior to its expiration.  Also, the purchase of rights involves the risk that the effective price paid for the right added to the subscription price of the related security may exceed the value of the subscribed security’s market price.

Large-Cap Company Risk – Larger, more established companies may be unable to respond quickly to new competitive challenges and are sometimes unable to attain the high growth rates of successful smaller companies during periods of economic expansion.

Mid-Cap Company Risk – Investing in mid-cap companies may involve greater risk than investing in large-cap companies due to less management experience, financial resources, product diversification and competitive strengths.  Therefore, such securities may be more volatile and less liquid than large-cap companies.

Small-Cap Company Risk – Investing in small-cap companies may involve greater risk than investing in large- or mid-cap companies due to less management experience, financial resources, product diversification and competitive strengths.  Therefore, such securities may be more volatile and less liquid than mid- and large-cap companies.

Convertible Securities Risk – Convertible securities generally offer lower interest or dividend yields than non-convertible debt securities of similar quality.  The value of a convertible security is influenced by changes in interest rates, with investment value declining as interest rates increase and increasing as interest rates decline.  The credit standing of the company and other factors also may have an effect on a convertible security’s investment value.

Foreign Risk – Investing in securities of foreign corporations involves additional risks relating to: political, social, religious and economic developments abroad; market instability; fluctuations in foreign exchange rates; different regulatory requirements, market practices, accounting standards and practices; and less publicly available information about foreign issuers.  Additionally, these investments may be subject to foreign withholding taxes, may be less liquid, carry higher brokerage commissions and other fees, and procedures and regulations governing transactions and custody in foreign markets also may involve delays in payment, delivery or recovery of money or investments.  Investments in common stocks of U.S. companies with international operations, and the purchase of sponsored or unsponsored ADRs carry similar risks.
Risk Lose Money [Text] rr_RiskLoseMoney If the value of the Fund's investments decreases, the value of the Fund's shares will also decrease and you may lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The performance information provides some indication of the risks of investing in the Dividend Focus Fund.  The bar chart shows the Fund’s performance for the 2013 calendar year and the table shows how the Fund’s average annual returns compare with those of a broad measure of market performance.  The performance information, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.  Updated performance information is available on the Fund’s website at http://www.buffalofunds.com/performance.html, or by calling the Fund toll-free at 1-800-49-BUFFALO (1-800-492-8332).

After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state or local taxes.  Actual after-tax returns depend on each investor’s individual tax situation and may differ from those shown in the table.  The after-tax returns shown are not relevant to investors who own the Dividend Focus Fund in a tax-deferred arrangement, such as an individual retirement account or a 401(k) plan.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The performance information provides some indication of the risks of investing in the Dividend Focus Fund. The bar chart shows the Fund's performance for the 2013 calendar year and the table shows how the Fund's average annual returns compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-492-8332
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://www.buffalofunds.com/performance.html
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The performance information, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading DIVIDEND FOCUS FUND Annual Total Return as of December 31 of Each Year
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Calendar Year-to-Date Return (through March 31, 2014) = 3.60%

Best Quarter through December 31, 2013: December 31, 2013 = 8.96%

Worst Quarter through December 31, 2013: June 30, 2013 = 3.50%
Year to Date Return, Label rr_YearToDateReturnLabel Calendar Year-to-Date Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2014
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.60%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2013
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.96%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn 3.50%
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state or local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on each investor's individual tax situation and may differ from those shown in the table. The after-tax returns shown are not relevant to investors who own the Dividend Focus Fund in a tax-deferred arrangement, such as an individual retirement account or a 401(k) plan.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns for the periods ended December 31, 2013
S&P 500® Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 32.39%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 31.44%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 03, 2012
Lipper Equity Income Funds Index® (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Lipper Equity Income Funds Index® (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 28.70%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 27.64%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 03, 2012
Buffalo Dividend Focus Fund
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management Fees rr_ManagementFeesOverAssets 0.90%
Other Expenses rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.94% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 300
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 520
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,155
Annual Return 2013 rr_AnnualReturn2013 23.93%
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 23.93%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 22.16%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 03, 2012
Buffalo Dividend Focus Fund | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 22.07%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 20.46%
Buffalo Dividend Focus Fund | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 14.00%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 16.35%
[1] Acquired Fund Fees and Expenses represent the indirect costs of the Fund's investments in other investment companies. The Total Annual Fund Operating Expenses for the Fund do not correlate to the ratio of expenses to average net assets listed in the Fund's financial highlights, which reflects the operating expenses of the Fund and does not include the amount of the Fund's proportionate share of the fees and expenses of other investment companies in which the Fund invests.