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Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Nov. 28, 2011
Reaves Select Research Fund (First Prospectus Summary) | Reaves Select Research Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading REAVES SELECT RESEARCH FUND
Investment Objective, Heading rr_ObjectiveHeading INVESTMENT OBJECTIVE
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The Reaves Select Research Fund (the "Fund") seeks total return from income and
capital growth.
Expense, Heading rr_ExpenseHeading FUND FEES AND EXPENSES
Expense, Narrative rr_ExpenseNarrativeTextBlock 
The table below describes the fees and expenses that you may pay if you buy and
hold Class A Shares of the Fund. You may qualify for sales charge discounts if
you and your family invest, or agree to invest in the future, at least $25,000
in Class A Shares of the Fund. More information about these and other discounts
is available from your financial professional and in the section "Sales
Charges" of this prospectus.
Shareholder Fees, Caption rr_ShareholderFeesCaption SHAREHOLDER FEES (FEES PAID DIRECTLY FROM YOUR INVESTMENT)
Operating Expenses, Caption 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 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
total annual fund operating expenses or in the example, affect the Fund's
performance. During its most recent fiscal year, the Fund's portfolio turnover
rate was 84% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 84.00%
Expense Breakpoint, Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in Class A Shares of the Fund.
Expense Breakpoint, Minimum Investment Required Amount rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 25,000
Expense Example, Heading rr_ExpenseExampleHeading EXAMPLE
Expense Example, Narrative 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 rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Investment Strategy, Heading rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock 
The Fund invests in securities of domestic and foreign public utility and
energy companies.  These include companies involved to a significant extent in
providing products, services or equipment for: (i) the generation, transmission
or distribution of electricity, gas or water; or (ii) telecommunications
activities ("Utilities" or the "Utilities Industry") as well as in companies
involved in the discovery, development, production, generation, transmission,
refinement, measurement, trading, marketing or distribution of energy ("Energy"
or the "Energy Industry"). The Fund may also invest in master limited
partnerships involving such companies. The Fund has adopted a policy to
concentrate its investments (invest at least 25% of its assets) in companies
involved to a significant extent in the Utilities and/or Energy Industries. The
Fund considers a company to be involved to a significant extent in the
Utilities Industry and/or the Energy Industry if at least 50% of its assets,
gross income or profits are committed to or derived from activities in the
industries described above. The Fund may also invest in municipal utility
companies, including rural electric cooperatives and similar organizations.
The Fund may utilize an active trading approach.

In selecting investments for the Fund, W.H. Reaves & Co., Inc. (the "Adviser")
seeks to identify securities that offer the potential for positive total return
during a three to five year period, based on, among other factors, a company's
market capitalization, balance sheet strength, expected dividends, and current
and expected earnings and cash flow. The Adviser may sell a holding if its
prospects for growth and income decline or when the Adviser deems it to be an
unattractive investment.
Investment Strategy, Portfolio Concentration rr_StrategyPortfolioConcentration The Fund invests in securities of domestic and foreign public utility and energy companies.
Risk, Heading rr_RiskHeading PRINCIPAL RISKS
Risk, Narrative rr_RiskNarrativeTextBlock 
As with all mutual funds, a shareholder is subject to the risk that his or her
investment could lose money. A FUND SHARE IS NOT A BANK DEPOSIT AND IS NOT
INSURED OR GUARANTEED BY THE FDIC, OR ANY GOVERNMENT AGENCY. The principal risk
factors affecting shareholders' investments in the Fund are set forth below.

Since it purchases equity securities, the Fund is subject to the risk that
stock prices will fall over short or extended periods of time. Historically,
the equity markets have moved in cycles, and the value of the Fund's equity
securities may fluctuate drastically from day to day. Individual companies may
report poor results or be negatively affected by industry and/or economic
trends and developments. The prices of securities issued by such companies may
suffer a decline in response. These factors contribute to price volatility,
which is the principal risk of investing in the Fund.

To the extent that the Fund's investments are focused in issuers conducting
business in the Utilities Industry and/or the Energy Industry, the Fund is
subject to the risk that legislative or regulatory changes, adverse market
conditions and/or increased competition will negatively affect these
industries. Fluctuations in the value of securities of companies in the
Utilities Industry and/or the Energy Industry depend to a large extent on the
price and supply of energy fuels. Many utility companies historically have been
subject to risks of increases in fuel, power and other operating costs, high
interest costs on borrowings needed for capital improvement programs and costs
associated with compliance with and changes in environmental and other governmental
regulations.

Although the Fund is diversified, its investment strategy often results in a
relatively focused portfolio of stocks of companies that the Adviser believes
hold the most total return potential.  As a result, poor performance or adverse
economic events affecting one or more of these companies could have a greater
impact on the Fund than it would on another mutual fund with a broader range of
investments.

The small- and medium-sized companies the Fund invests in may be more
vulnerable to adverse business or economic events than larger, more established
companies.  In particular, these small- and medium-sized companies may pose
additional risks, including liquidity risk, because these companies tend to
have limited product lines, markets and financial resources, and may depend
upon a relatively small management group.  Therefore, small- and mid-cap stocks
may be more volatile than those of larger companies. These securities may be
traded over-the-counter or listed on an exchange.

Investing in foreign companies poses additional risks since political and
economic events unique to a country or region will affect those markets and
their issuers. These events will not necessarily affect the U.S. economy or
similar issuers located in the United States.  In addition, investments in
foreign companies are generally denominated in a foreign currency. As a result,
changes in the value of those currencies compared to the U.S. dollar may affect
(positively or negatively) the value of the Fund's investments. These currency
movements may occur separately from and in response to events that do not
otherwise affect the value of the security in the issuer's home country.

Master Limited Partnerships ("MLPs") are limited partnerships in which the
ownership units are publicly traded. MLP units are registered with the U.S.
Securities and Exchange Commission (the "SEC") and are freely traded on a
securities exchange or in the over-the-counter market. MLPs often own several
properties or businesses (or own interests) that are related to oil and gas
industries or other natural resources, but they also may finance other
projects. To the extent that an MLP's interests are all in a particular
industry, the MLP will be negatively impacted by economic events adversely
impacting that industry. Generally, a MLP is operated under the supervision of
one or more managing general partners. Limited partners are not involved in the
day-to-day management of the partnership. The risks of investing in a MLP are
generally those involved in investing in a partnership as opposed to a
corporation. For example, state law governing partnerships is often less
restrictive than state law governing corporations. Accordingly, there may be
fewer protections afforded to investors in a MLP than investors in a
corporation. For example, investors in MLPs may have limited voting rights or
be liable under certain circumstances for amounts greater than the amount of
their investment. In addition, MLPs may be subject to state taxation in certain
jurisdictions which will have the effect of reducing the amount of income paid
by the MLP to its investors.

Because of its active trading strategy, the Fund's portfolio turnover rate and
transaction costs will generally be higher than those of funds with less active
trading strategies, which may lower fund performance and increase the
likelihood of capital gains distributions.
Risk, Lose Money rr_RiskLoseMoney As with all mutual funds, a shareholder is subject to the risk that his or her investment could lose money.
Risk, Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution A FUND SHARE IS NOT A BANK DEPOSIT AND IS NOT INSURED OR GUARANTEED BY THE FDIC, OR ANY GOVERNMENT AGENCY.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading PERFORMANCE INFORMATION
Performance, Narrative rr_PerformanceNarrativeTextBlock 
The bar chart and the performance table below illustrate the risks and
volatility of an investment in the Class A Shares of the Fund by showing
changes in the Fund's Class A Shares' performance from year to year and by
showing how the Fund's Class A Shares' average annual total returns for 1 and 5
years and since inception compare with those of a broad measure of market
performance. Of course, the Fund's past performance (before and after taxes)
does not necessarily indicate how the Fund will perform in the future. Updated
performance information is available by calling 1-866-342-7058. The performance
information shown below does not reflect sales charges that may be paid when
investors buy Class A Shares of the Fund. If sales charges were reflected, the returns
would be less than those shown.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the performance table below illustrate the risks and volatility of an investment in the Class A Shares of the Fund by showing changes in the Fund's Class A Shares' performance from year to year and by showing how the Fund's Class A Shares' average annual total returns for 1 and 5 years and since inception compare with those of a broad measure of market performance.
Performance, Availability Phone Number rr_PerformanceAvailabilityPhone 1-866-342-7058
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture Of course, the Fund's past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Bar Chart, Narrative rr_BarChartNarrativeTextBlock 
The performance information shown below does not reflect sales charges that may
be paid when investors buy Class A Shares of the Fund. If sales charges were
reflected, the returns would be less than those shown.
Bar Chart, Does Not Reflect Sales Loads rr_BarChartDoesNotReflectSalesLoads If sales charges were reflected, the returns would be less than those shown.
Bar Chart, Closing rr_BarChartClosingTextBlock 
BEST QUARTER       WORST QUARTER
16.37%             (23.21)%
(06/30/2009)         (09/30/2008)

The performance information shown above is based on a calendar year. The Fund's
Class A Shares' performance from 1/1/2011 to 9/30/2011 was (1.63)%.
Index No Deduction for Fees, Expenses, Taxes 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 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 an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table, Narrative rr_PerformanceTableNarrativeTextBlock 
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. Actual after-tax returns depend on an investor's tax situation and
may differ from those shown. After-tax returns shown are not relevant to
investors who hold their Fund shares through tax-deferred arrangements, such as
401(k) plans or individual retirement accounts.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS FOR PERIODS ENDED DECEMBER 31, 2010
Reaves Select Research Fund (First Prospectus Summary) | Reaves Select Research Fund | Class A Shares
  
Risk/Return: rr_RiskReturnAbstract  
Year to Date Return, Label rr_YearToDateReturnLabel The performance information shown above is based on a calendar year.
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (1.63%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel BEST QUARTER
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel WORST QUARTER
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.21%)
Reaves Select Research Fund | S&P 500 Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel S&P 500 INDEX (REFLECTS NO DEDUCTION FOR FEES, EXPENSES OR TAXES)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.06%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.29%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.22%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 2005
Average Annual Returns, Since Inception Secondary ck0000890540_AverageAnnualReturnSinceInceptionSecondary 2.75%
Average Annual Returns, Inception Date Secondary ck0000890540_AverageAnnualReturnInceptionDateSecondary Dec. 22, 2004
Reaves Select Research Fund | S&P 500 Utilities Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel S&P 500 UTILITIES INDEX (REFLECTS NO DEDUCTION FOR FEES, EXPENSES OR TAXES)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.46%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.90%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.42%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 2005
Average Annual Returns, Since Inception Secondary ck0000890540_AverageAnnualReturnSinceInceptionSecondary 5.82%
Average Annual Returns, Inception Date Secondary ck0000890540_AverageAnnualReturnInceptionDateSecondary Dec. 22, 2004
Reaves Select Research Fund | Class A Shares
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.75%
Maximum Deferred Sales Charge (Load) (as a percentage of net asset value) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends and Other Distributions (as a percentage of offering price) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of amount redeemed if applicable) rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.69%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.69%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 639
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 982
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,349
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,378
Annual Return 2006 rr_AnnualReturn2006 18.71%
Annual Return 2007 rr_AnnualReturn2007 21.38%
Annual Return 2008 rr_AnnualReturn2008 (40.82%)
Annual Return 2009 rr_AnnualReturn2009 23.05%
Annual Return 2010 rr_AnnualReturn2010 11.77%
Average Annual Returns, Label rr_AverageAnnualReturnLabel FUND RETURNS BEFORE TAXES
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.48%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.24%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.53%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 2005
Reaves Select Research Fund | Class A Shares | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel FUND RETURNS AFTER TAXES ON DISTRIBUTIONS
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.26%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.54%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.86%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 2005
Reaves Select Research Fund | Class A Shares | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel FUND RETURNS AFTER TAXES ON DISTRIBUTIONS AND SALE OF FUND SHARES
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.47%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.55%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.69%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Mar. 30, 2005