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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Buffalo International Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment objective of the Buffalo International Fund (“International Fund” or the “Fund”) is long-term growth of capital.
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 15% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 15.00%
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
The International Fund invests primarily in equity securities of established companies that are economically tied to various countries throughout the world (excluding the U.S.).  The Fund may invest directly or indirectly in foreign securities or foreign currencies of both developed and developing countries.  For purposes of the International Fund’s investments, “foreign securities” means those securities issued by companies:

·  
that are organized under the laws of, or with a principal office in, a country other than the U.S. and issue securities for which the principal trading market is in a country other than the U.S.; or

·  
that derive at least 50% of their revenues or profits from goods produced or sold, investments made, or services provided in a country other than the U.S., or have at least 50% of their assets in a country other than the U.S.

Under normal circumstances, the International Fund does not expect its investments in emerging markets to exceed 35% of its net assets.  Equity securities in which the International Fund will invest include common stocks, preferred stocks, convertible securities, warrants, rights and depositary receipts.  The Fund’s investments in depositary receipts may include sponsored or unsponsored ADRs, European Depositary Receipts (“EDRs”) or Global Depositary Receipts (“GDRs”).  The International Fund may invest in securities of companies of any size.

In selecting securities for the International Fund, the Advisor uses a bottom-up approach in choosing investments.  The Advisor seeks to identify companies for the International Fund’s portfolio that are expected to experience growth based on the identification of long-term, measurable industry, technological global or other trends.  Companies are screened using in-depth, in-house research to identify those which the Advisor believes have favorable attributes, including attractive valuation, strong management, conservative debt, free cash flow, scalable business models, and competitive advantages.  In making portfolio selections for the International Fund, the Advisor will also consider the economic, political and market conditions of the various countries in which the Fund may invest.  The Advisor may sell the International 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 International Fund cannot guarantee that it will achieve its investment objective.  As with any mutual fund, the value of the Fund’s investments may fluctuate.  If the value of the International Fund’s investments decreases, the value of the Fund’s shares will also decrease and you may lose money.  The risks associated with the International 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 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 International Fund may experience sudden, unpredictable drops in value or long periods of decline in value due to general stock market fluctuations, increases in production costs, decisions by management or related 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.

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, EDRs and GDRs carry similar risks.

American Depositary Receipts – Unsponsored ADRs held by the Fund are frequently under no obligation to distribute shareholder communications received from the underlying issuer.  For this and other reasons, there is less information available about unsponsored ADRs than sponsored ADRs.  Unsponsored ADRs are also not obligated to pass through voting rights to the Fund.  Investing in foreign companies, even indirectly through ADRs, may involve the same inherent risks as investing in securities of foreign issuers, as described above.

Emerging Markets Risk – Emerging markets are markets of countries, such as China, the Philippines and India, in the initial stages of industrialization and that generally have low per capita income.  In addition to the risks of foreign securities in general, emerging markets are generally more volatile, have relatively unstable governments, social and legal systems that do not protect shareholders, economies based on only a few industries and securities markets that are substantially smaller, less liquid and more volatile with less government oversight than more developed countries.

Currency Risk – When the International Fund buys or sells securities on a foreign stock exchange, the transaction is undertaken in the local currency rather than in U.S. dollars, which carries the risk that the value of the foreign currency will increase or decrease, which may impact the value of the Fund’s portfolio holdings and your investment.  China and other countries may adopt economic policies and/or currency exchange controls that affect its currency valuations in a disadvantageous manner for U.S. investors and companies and restrict or prohibit the Fund’s ability to repatriate both investment capital and income, which could place the International Fund’s assets at risk of total loss.

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.
Risk Lose Money [Text] rr_RiskLoseMoney If the value of the International 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 International Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for one year and since inception compare with those of a broad measure of market performance and the returns of additional indexes of securities with characteristics similar to those that the Fund typically holds.  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 International 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 International Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for one year and since inception compare with those of a broad measure of market performance and the returns of additional indexes of securities with characteristics similar to those that the Fund typically holds.
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 INTERNATIONAL 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) = (0.09%)

Best Quarter through December 31, 2013: June 30, 2009 = 31.64%

Worst Quarter through December 31, 2013: September 30, 2008 = (21.68%)
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 (0.09%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 31.64%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.68%)
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 International 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
MSCI AC World Index Ex USA® (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel MSCI AC World Index Ex USA® (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.29%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 12.81%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (0.18%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 28, 2007
Lipper International Funds Index® (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Lipper International Funds Index® (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 21.22%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.27%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 0.64%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 28, 2007
Buffalo International Fund
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management Fees rr_ManagementFeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.07%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.08% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 110
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 343
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 595
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,317
Annual Return 2008 rr_AnnualReturn2008 (40.82%)
Annual Return 2009 rr_AnnualReturn2009 46.45%
Annual Return 2010 rr_AnnualReturn2010 13.73%
Annual Return 2011 rr_AnnualReturn2011 (13.82%)
Annual Return 2012 rr_AnnualReturn2012 19.01%
Annual Return 2013 rr_AnnualReturn2013 19.29%
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 19.29%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 15.30%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.15%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 28, 2007
Buffalo International Fund | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 19.31%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 15.36%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.21%
Buffalo International 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 11.04%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 12.54%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.61%
[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.