Total Annual Operating Expenses do not correlate to the ratio of expenses to average net assets given in the financial highlights due to a reduction in the expense cap.

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, except that it reflects the Expense Cap through the time periods described above. Although your actual costs may be higher or lower, based on these assumptions, whether you do or do not redeem your shares at the end of each period described below, your costs would be:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests primarily in equity securities, consisting of common, preferred and convertible stock of domestic companies and real estate investment trusts ("REITs") that the Adviser believes possess superior long-term growth characteristics and have strong, sustainable earnings prospects and reasonably valued stock prices. The Fund may also invest in companies that do not have particularly strong earnings histories but do have other attributes that the Adviser believes may contribute to accelerated growth in the foreseeable future. The Fund primarily invests in medium- and large-size domestic companies. For these purposes, the Adviser defines medium-size companies as those with market capitalizations in the range of $3 billion to $20 billion, and large-size companies as those with market capitalizations greater than $20 billion.

The Fund's investment strategy also permits the Fund to invest in small-size companies, which, according to the Adviser, are companies that typically have market capitalizations under $3 billion.

If the Fund is not invested primarily in medium- and large-size domestic companies due to, among other things, decreases in the market capitalization of those companies in the Fund's portfolio since they were purchased, the Fund will limit new investments to medium- and large-size domestic companies.

The Adviser relies on selecting individual stocks and does not try to predict when the stock market may rise or fall. The Adviser uses in-house research and other sources to conduct analyses of prospective Fund investments. Under normal market conditions, the Fund will typically hold approximately 25-50 stocks.

In purchasing Fund investments, the Adviser's process begins with an economic analysis of prospective Fund investments across a range of industries, including, but not limited to, investments in the information technology sector, in which the Fund currently invests a significant portion of its net assets. The Adviser then uses fundamental research to identify companies that it believes are well managed, are leaders in an industry niche, are consistent producers and/or exhibit sustainable growth.

The Adviser may sell a stock in the Fund's portfolio if, for example, the Adviser believes it has become overvalued or its fundamentals have changed. The Adviser may also change the weighting in a stock if it becomes an excessively large position within the Fund due to appreciation. In addition, the Fund may strategically invest a significant portion of the Fund's total assets in cash or cash equivalents if in certain market conditions other appropriate investments for the Fund are not available at prices the Adviser believes are favorable to the Fund.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

The Fund's net asset value ("NAV") and investment return will fluctuate based upon changes in the value of its portfolio securities. You could lose money on your investment in the Fund, and the Fund could underperform other investments. There is no guarantee that the Fund will meet its investment objective. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

It is important that you closely review and understand the risks of investing in the Fund prior to making an investment in the Fund.

Capital Gains Risk. The sale of securities held in the Fund's portfolio may generate capital gains if the value of a security sold has appreciated since the time of the Fund's initial investment. There can be no guarantee that the Fund will not distribute such capital gains.

Redemption Risk. The Fund could experience a loss when selling securities to meet redemption requests by shareholders. The risk of loss increases if the redemption requests are unusually large or frequent or occur in times of overall market turmoil or declining prices. Furthermore, the Fund currently has a large shareholder controlled by the Fund's Adviser, which could redeem shares to the detriment of other shareholders.

Market Events Risk. Turbulence in the financial markets and reduced liquidity in equity, credit and fixed-income markets may negatively affect issuers worldwide, which could have an adverse effect on the Fund. In addition, there is a risk that policy changes by the Federal Reserve and/or other government actors, such as increasing interest rates, could cause increased volatility in financial markets, and higher levels of Fund redemptions, which could have a negative impact on the Fund. Trade barriers and other protectionist trade policies (including those in the U.S.) may also have a negative impact on the Fund.

Management Risk. The Fund is actively managed and its performance will reflect the Adviser's ability to make investment decisions that are suited to achieving the Fund's investment objective.

Focused Fund Risk. The Fund employs a strategy of investing in the securities of a limited number of companies, some of which may be in the same industry, sector or geographic region. As a result, the Fund may incur more risk because changes in the value of a single security may have a more significant effect, either positive or negative, on the Fund's net asset value. Further, the Fund may be more sensitive to events affecting a single industry, sector or geographic region. The use of such a focused investment strategy may increase the volatility of the Fund's investment performance, as the Fund may be more susceptible to risks associated with a single economic, political or regulatory event than a portfolio that is more broadly invested.

Growth Company Risk. The Fund's investments in growth securities may be more sensitive to company earnings and more volatile than the market in general primarily because their stock prices are based heavily on future expectations. If the Adviser's assessment of the prospects for a company's growth is wrong, or if the Adviser's judgment of how other investors will value the company's growth is wrong, then the price of the company's stock may fall or not approach the value that the Adviser has placed on it.

Information Technology Sector Risk. The Fund currently invests a portion of its assets in the information technology sector, and therefore the Fund's performance could be negatively impacted by events affecting this sector. The information technology sector includes, for example, internet, semiconductor, software, hardware, and technology equipment companies. This sector can be affected by, among other things, the supply and demand for specific products and services, the pace of technological development, and government regulation.

Equity Risk. Equity holdings, which include common stocks may decline in value because of changes in the price of a particular holding or a broad stock market decline. Common stock ranks below preferred stock and debt securities in claims for dividends and for assets of the company in a liquidation or bankruptcy. The value of a security may decline for a number of reasons that directly relate to the issuer of a security or broader economic or market events including changes in interest rates.

Small and Mid-Sized Capitalization Company Risk. Investments in small and mid-sized capitalization companies may be less liquid, and the prices of such securities may fluctuate more than those of larger, more established companies. These factors could adversely affect the Fund's ability to sell such securities at a desirable time and price.

Cash and Cash Equivalents Risk. To the extent the Fund holds cash and cash equivalents positions, even strategically, the Fund risks achieving lower returns and potential lost opportunities to participate in market appreciation, which could negatively impact the Fund's performance and ability to achieve its investment objective. This is particularly true when the market for other investments in which the Fund may invest is rapidly rising.

Large Capitalization Company Risk. The Fund's investments in large capitalization companies may underperform other segments of the market because they may be less responsive to competitive challenges and opportunities and unable to attain high growth rates during periods of economic expansion.

Industrial Sector Risk. To the extent the Fund invests a significant portion of its assets in the industrial sector, the Fund's performance could be negatively impacted by events affecting this sector. The industrial sector includes, for example, aerospace and defense, non-residential construction, engineering, machinery, transportation, and commercial and professional services companies. This sector can be significantly affected by, among other things, business cycle fluctuations, worldwide economy growth, government and corporate spending, supply and demand for specific products and manufacturing, and government regulation.

REIT Risk. The value of the Fund's investments in REITs may change in response to changes in the real estate market such as declines in the value of real estate, lack of available capital or financing opportunities, and increases in property taxes or operating costs. REITs typically are subject to management fees and other expenses that are separate from those of the Fund.

Preferred Stock Risk. Preferred stock is a class of a capital stock that typically pays dividends at a specified rate. Preferred stock is generally senior to common stock, but subordinate to debt securities, with respect to the payment of dividends and on liquidation of the issuer. The market value of preferred stock generally decreases when interest rates rise and is also affected by the issuer's ability to make payments on the preferred stock.

Convertible Securities Risk. Investments in convertible securities entail some of the risks of both equity and debt securities. The value of convertible securities tends to decline as interest rates rise and, because of the conversion feature, tends to vary with the fluctuations in the market value of the underlying securities or any changes in the issuer's credit rating. Convertible securities are subject to the risk that the credit rating of the issuer may have an effect on the value of the convertible securities.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance Narrative [Text Block]

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The bar chart and table that follow provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund from year to year and by showing how the Fund's average annual returns compare with those of a broad measure of market performance. Updated performance information is available at www.dfdent.com or by calling (866) 2DF-DENT or (866) 233-3368 (toll free).

Performance information (before and after taxes) represents only past performance and does not necessarily indicate future results.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(866) 2DF-DENT or (866) 233-3368

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Performance information (before and after taxes) represents only past performance and does not necessarily indicate future results.

Bar Chart Closing [Text Block]

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During the period shown, the highest return for a quarter was 20.09% for the quarter ended June 30, 2009, and the lowest return was -17.22% for the quarter ended September 30, 2011.

The calendar year-to-date total return as of September 30, 2019 was 33.25%.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns 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 Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

The return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.

Trading Symbol

dei_TradingSymbol

DFDPX

Maximum Deferred Sales Charge (Load) (as a percentage of the offering price)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Redemption Fee (as a percentage of amount redeemed, if applicable)

rr_RedemptionFeeOverRedemption

none

Management Fees

rr_ManagementFeesOverAssets

0.99%

Other Expenses

rr_OtherExpensesOverAssets

0.20%

Fee Waiver and/or Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.20%)

^[1]

One Year

rr_ExpenseExampleYear01

$ 101

Five Years

rr_ExpenseExampleYear05

635

Annual Return 2009

rr_AnnualReturn2009

30.30%

Annual Return 2011

rr_AnnualReturn2011

1.70%

Annual Return 2013

rr_AnnualReturn2013

34.51%

Annual Return 2015

rr_AnnualReturn2015

1.54%

Annual Return 2017

rr_AnnualReturn2017

31.84%

Year to Date Return, Label

rr_YearToDateReturnLabel

year-to-date total return

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

33.25%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(17.22%)

5 Years

rr_AverageAnnualReturnYear05

7.96%

1 Year

rr_AverageAnnualReturnYear01

(0.12%)

10 Years

rr_AverageAnnualReturnYear10

13.40%

Prospectus [Line Items]

rr_ProspectusLineItems

5 Years

rr_AverageAnnualReturnYear05

6.10%

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

5 Years

rr_AverageAnnualReturnYear05

8.49%

Risk/Return [Heading]

rr_RiskReturnHeading

DF Dent Midcap Growth Fund

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The objective of the DF Dent Midcap Growth Fund (the "Fund") is to seek long-term capital appreciation.

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.

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, Rate

rr_PortfolioTurnoverRate

29.00%

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, except that it reflects the Expense Cap through the time periods described above. Although your actual costs may be higher or lower, based on these assumptions, whether you do or do not redeem your shares at the end of each period described below, your costs would be:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in equity securities of medium-size companies ("80% Policy"). For these purposes, the Fund's Adviser defines medium-sized companies as those companies with market capitalizations in the range of $1.023 billion to $57.7 billion, which was the three-year average of the market capitalization range of companies in the Russell Midcap Growth^® Index on May 31, 2017, 2018 and 2019.

The Fund typically invests in U.S.-listed equity securities, consisting of common stocks, preferred stocks, securities convertible into U.S. common stocks, real estate investment trusts ("REITs"), American Depositary Receipts ("ADRs"), and exchange-traded funds ("ETFs"). The Fund invests in equity securities of domestic companies that in the Adviser's view possess superior long-term growth characteristics and have strong, sustainable earnings prospects and reasonably valued stock prices. The Fund may invest in companies that do not have particularly strong earnings histories but do have other attributes that in the Adviser's view may contribute to accelerated growth in the foreseeable future.

The Adviser relies on selecting individual stocks and does not try to predict when the stock market may rise or fall. The Adviser uses in-house research and other sources to conduct analyses of prospective Fund investments.

In purchasing Fund investments, the Adviser's process begins with an economic analysis of prospective Fund investments across a range of industries, including, but not limited to, investments in the industrial sector and the information technology sector, in each of which the Fund currently invests a significant portion of its net assets. The Adviser then uses fundamental research to identify companies that it believes are well managed, are leaders in an industry niche, are consistent producers and/or exhibit sustainable growth.

The Adviser may sell a security in the Fund's portfolio if, for example, the Adviser believes it has become overvalued or its fundamentals have changed. The Adviser may also change the weighting in a stock if it becomes an excessively large position within the Fund due to appreciation. In addition, the Fund may strategically invest a significant portion of the Fund's total assets in cash or cash equivalents if in certain market conditions other appropriate investments for the Fund are not available at prices the Adviser believes are favorable to the Fund.