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Frontier MFG Core Infrastructure Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Frontier MFG Core Infrastructure Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective.
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the Frontier MFG Core Infrastructure Fund (the “Fund”) is long-term capital appreciation.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Oct. 31, 2018
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 its 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%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates The Service Class shares commenced operations on July 15, 2016. Accordingly, “Additional Other Expenses” for the Service Class shares are estimated based on other expenses of the Institutional Class shares of the Fund for the fiscal year ended June 30, 2016.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Acquired Fund Fees and Expenses (“AFFE”) are fees and expenses incurred by the Fund in connection with its investments in investment companies. Total Annual Fund Operating Expenses shown will not correlate to the Fund’s ratio of expenses to average net assets appearing in the Financial Highlights table, which do not include AFFE.
Expense Example [Heading] rr_ExpenseExampleHeading Example.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the shares of 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 Strategy.
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund invests at least 80% of its net assets in equity securities of infrastructure companies, such as utilities, toll roads, energy infrastructure, airports, ports and communications companies.  For purposes of the 80% policy, net assets include any borrowings for investment purposes.  The Fund will concentrate in the infrastructure sector and the utilities industry.  The Fund will invest in both U.S. and non-U.S. companies.  The Fund’s subadviser, Magellan Asset Management Limited doing business as MFG Asset Management (“MFG Asset Management”), seeks to provide investors with exposure to the infrastructure sector and to deliver stable investment returns relative to other equity funds.  The Fund invests in a diversified portfolio of securities of infrastructure and utility companies that MFG Asset Management has determined have an appropriate capital structure, are likely to generate reliable income streams and are likely to benefit from inflation protection.


The Fund’s investment universe will principally consist of companies whose predominant source of earnings is derived from the following infrastructure assets:


·


Regulated energy utilities;


·


Regulated water utilities;


·


Toll roads;


·


Energy infrastructure;


·


Airports;


·


Ports;


·


Communications infrastructure; and


·


Social infrastructure.


It is anticipated that the Fund’s portfolio will generally consist of 80 to 100 companies.
Risk [Heading] rr_RiskHeading Principal Investment Risks.
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Market Risks.  The Fund’s investments are subject to market risk, which may cause the value of the Fund’s investments to decline.  If the value of the Fund’s investments goes down, the share price of the Fund will go down, and you may lose money.  U.S. and international markets have experienced extreme volatility, reduced liquidity, credit downgrades, increased likelihood of default and valuation difficulties in recent years.


Equity Securities Risks.  Common stocks and other equity securities held by the Fund will fluctuate in value based on the earnings of the company and on general industry and market conditions, leading to fluctuations in the Fund’s share price.


Stock Selection Risks.  The stocks selected for the Fund may decline in value or not increase in value when the stock market in general is rising.


Foreign Securities Risks.  Investments in securities of foreign companies involve additional risks, including less liquidity, currency-rate fluctuations, political and economic instability, differences in financial reporting standards and securities market regulation, and imposition of foreign withholding taxes.  In June 2016, the United Kingdom (“UK”) voted to leave the European Union (“EU”) following a referendum referred to as “Brexit.”   There is significant market uncertainty regarding Brexit’s ramifications, and the range of possible political, regulatory, economic, and market outcomes are difficult to predict.   Geopolitical events, including those in Ukraine and the Middle East, may cause market disruptions. 


Currency Risks.  The value of the Fund’s foreign holdings as measured in U.S. dollars may be affected unfavorably by changes in foreign currency exchange rates.  The Fund may also incur costs in connection with conversions between various currencies.


Management Risks.  The Fund is subject to management risk as an actively-managed investment portfolio and depends on the decisions of the portfolio management team to produce the desired results.


Infrastructure Investment Risks.  The Fund’s investments in infrastructure companies will expose the Fund to potential adverse economic, regulatory, political and other changes affecting such investments.  Issuers of securities in infrastructure-related businesses are subject to a variety of factors that may adversely affect their business or operations, including high interest costs in connection with capital construction programs, high leverage, costs associated with environmental or other regulations, the effects of economic slowdowns, adverse changes in fuel prices, the effects of energy conservation policies and other factors.  Transportation infrastructure companies can be significantly affected by economic changes, fuel prices, labor relations, insurance costs and government regulations.


Utilities Industry Risks.  Utility company revenues and costs are subject to regulation by states and other regulators.  Regulatory authorities also may restrict a company’s access to new markets.  The deregulation of certain utilities companies may subject these companies to greater risks of loss.  Utilities companies may incur unexpected increases in fuel and other operating costs.  Rising interest rates could lead to higher financing costs and reduced earnings.  Utilities are also subject to considerable costs associated with environmental compliance, nuclear waste clean-up and safety regulation.  There is a risk that these costs will not be fully recovered through an increase in revenues.


Small- and Medium-Capitalization Company Risks.  Small-capitalization and medium-capitalization companies are often more volatile and less liquid than larger companies.  Securities of these companies may be subject to greater and more abrupt price fluctuations and may be more susceptible to market pressures and business failures.  Stocks of small and medium-sized companies may underperform the stocks of larger companies as an asset class.


Cybersecurity Risks.  Despite the various protections utilized by the Fund and its service providers, systems, networks, or devices utilized by the Fund potentially can be breached.  The Fund and its shareholders could be negatively impacted as a result of a cybersecurity breach.
Risk Lose Money [Text] rr_RiskLoseMoney If the value of the Fund’s investments goes down, the share price of the Fund will go down, and you may lose money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance.
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The return information provided in the following bar chart and table illustrates how the performance of the Fund can vary from year to year, which is one indication of the risks of investing in the Fund.  The bar chart shows the changes in the Fund’s performance from year to year, while the table compares the average annual total returns of the Fund to a broad measure of market performance.  Please keep in mind that the Fund’s past performance (before and after taxes) does not necessarily represent how it will perform in the future.  Updated performance data is available on the Company’s website at www.frontiermutualfunds.com or by calling toll-free to 1-888-825-2100.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The return information provided in the following bar chart and table illustrates how the performance of the Fund can vary from year to year, which is one indication of the risks of investing in the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-825-2100
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.frontiermutualfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please keep in mind that the Fund’s past performance (before and after taxes) does not necessarily represent how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Return for Institutional Class Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fund’s return from January 1, 2016, through September 30, 2016, was 12.25%.  


Best and Worst Quarterly Performance (during the periods shown above)


Best Quarter Return

 

Worst Quarter Return

 

 

 

7.80% (1st quarter, 2014)

 

(3.89)% (3rd quarter, 2014)
Year to Date Return, Label rr_YearToDateReturnLabel The Fund’s return from January 1, 2016, through September 30, 2016
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2016
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 12.25%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.80%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2014
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.89%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deductions for fees, expense or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns for the Fund were 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, and after-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as a 401(k) plan or individual retirement account (“IRA”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Institutional Class shares, and the after-tax returns for Service Class shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are shown only for Institutional Class shares, and the after-tax returns for Service Class shares will vary.  After-tax returns for the Fund were 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, and after-tax returns are not relevant to investors who hold shares of the Fund through tax-deferred arrangements, such as a 401(k) plan or individual retirement account (“IRA”). In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other return figures for the same period.  A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the periods ended December 31, 2015)
Frontier MFG Core Infrastructure Fund | MSCI World Index (Net) (reflects no deductions for fees, expense or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel MSCI World Index (Net) (reflects no deductions for fees, expense or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.87%) [1],[2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 10.35% [1],[2],[3]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 18, 2012 [1],[2]
Frontier MFG Core Infrastructure Fund | S&P Global Infrastructure Index  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P Global Infrastructure Index
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (11.46%) [1],[4]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.39% [1],[3],[4]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 18, 2012 [1],[4]
Frontier MFG Core Infrastructure Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption (2.00%)
Redemption Fee rr_RedemptionFee $ (15.00)
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fee rr_Component1OtherExpensesOverAssets none
Additional Other Expenses rr_Component3OtherExpensesOverAssets 0.13% [5]
Total Other Expenses rr_OtherExpensesOverAssets 0.13%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [6]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.13%) [7]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.71%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 73
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 241
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 440
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,012
Annual Return 2013 rr_AnnualReturn2013 12.41%
Annual Return 2014 rr_AnnualReturn2014 16.63%
Annual Return 2015 rr_AnnualReturn2015 (1.03%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.03%) [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 10.79% [1],[3]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jan. 18, 2012 [1]
Frontier MFG Core Infrastructure Fund | Institutional Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.51%) [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 10.37% [1],[3]
Frontier MFG Core Infrastructure Fund | Institutional Class | 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 0.12% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.72% [1],[3]
Frontier MFG Core Infrastructure Fund | Service Class  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption (2.00%)
Redemption Fee rr_RedemptionFee $ (15.00)
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fee rr_Component1OtherExpensesOverAssets 0.15%
Additional Other Expenses rr_Component3OtherExpensesOverAssets 0.13% [5]
Total Other Expenses rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [6]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.99%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.13%) [7]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 289
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 521
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,189
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Because the Service Class has not been offered for a full calendar year, the information provided represents returns of the Institutional Class.
[1] Because the Service Class has not been offered for a full calendar year, the information provided represents returns of the Institutional Class.
[2] The MSCI World Index measures the overall performance of stock markets in 23 developed market countries in North America, Europe, and the Asia/Pacific Region.
[3] The Institutional Class commenced operations on January 18, 2012.
[4] The S&P Global Infrastructure Index is a global developed markets infrastructure and utilities benchmark.
[5] The Service Class shares commenced operations on July 15, 2016. Accordingly, "Additional Other Expenses" for the Service Class shares are estimated based on other expenses of the Institutional Class shares of the Fund for the fiscal year ended June 30, 2016.
[6] Acquired Fund Fees and Expenses ("AFFE") are fees and expenses incurred by the Fund in connection with its investments in investment companies. Total Annual Fund Operating Expenses shown will not correlate to the Fund's ratio of expenses to average net assets appearing in the Financial Highlights table, which do not include AFFE.
[7] Pursuant to an expense cap agreement between Frontegra Asset Management, Inc. ("Frontegra"), the Fund's investment adviser, and the Fund, Frontegra has contractually agreed to waive its management fee and/or reimburse the Fund's operating expenses to the extent necessary to ensure that the Fund's total operating expenses (excluding taxes, interest, brokerage commissions, AFFE and extraordinary expenses) do not exceed 0.70% and 0.85% of the Fund's average daily net assets attributable to Institutional Class and Service Class shares, respectively. Frontegra is entitled to recoup the fees waived and/or expenses reimbursed within a three-year period from the time the expenses were incurred to the extent of the expense limitation described above and in place at the time of recoupment. The expense cap agreement will continue in effect until October 31, 2018, with successive renewal terms of one year unless terminated by Frontegra or the Company prior to any such renewal.