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

The investment objective of the Frontier MFG Select Infrastructure Fund (the “Fund”) is to seek attractive risk-adjusted returns over the medium- to long-term, while reducing the risk of permanent capital loss.
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, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
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, 2022
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 40% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 40.00%
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 a minimum of 80% of its net assets in the equity securities of infrastructure companies. The Fund will invest in common stock, stapled securities (an equity security comprised of multiple parts) and Real Estate Investment Trusts (“REITs”) of infrastructure companies as part of its principal investment strategy. The Fund will concentrate in the securities of companies operating in infrastructure-related industries. The Fund will invest in both U.S. and non-U.S. companies and may invest in companies of any size, with a minimum market capitalization of $500 million. With respect to its non-U.S. investments, the Fund invests in companies located in developed countries but may also invest in emerging markets as part of its principal investment strategy.

 

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 will invest in a non-diversified portfolio of securities of infrastructure 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 will normally hold a limited number (typically 20 to 40) of companies that meet these criteria. The Fund will typically hold up to 20% of its assets in cash and cash equivalents.
Risk [Heading] rr_RiskHeading Principal Investment Risks.
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Market Risks; Recent Market Events. 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 volatility in recent months and years due to a number of economic, political and global macro factors, including the impact of the coronavirus (COVID-19) global pandemic, which has resulted in public health issues, business interruptions, growth concerns in the U.S. and overseas, layoffs, rising unemployment claims, changed travel and social behaviors and reduced consumer spending. The effects of COVID-19 may lead to a substantial economic downturn or recession in the U.S. and global economies, the recovery from which is uncertain and may last for an extended period of time. Continuing market volatility may have adverse effects on the Fund.

 

Common Stocks Risks. Common stocks 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.

 

REIT Risks. A REIT’s share price may decline because of adverse developments affecting the underlying infrastructure industry, including changes to interest rates. The returns of REITs may trail returns of the overall market. The Fund’s investments in REITs may be subject to special tax rules, or a particular REIT may fail to qualify for the favorable federal income tax treatment applicable to REITs, the effect of which may have adverse tax consequences for the Fund and shareholders. The Fund will indirectly bear its proportionate share of expenses incurred by REITs in which the Fund invests in addition to the expenses incurred directly by the Fund.

 

Stapled Securities Risks. A stapled security is a security that is comprised of multiple parts (a trust and a share of a company) that cannot be separated from one another and is treated as one unit for trading purposes. The value of a stapled security may go down as a result of the performance of any part of the security.

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 the imposition of foreign withholding taxes.

 

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.

 

Non-Diversification Risks. The Fund is non-diversified, which means it may invest more of its assets in a smaller number of companies than funds that are diversified. Gains or losses on a single stock may have greater impact on the Fund than for funds that invest in a greater number of companies.

 

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

 

Infrastructure Concentration Risk. 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 and the effects of economic slowdowns. Rising interest rates could lead to higher financing costs and reduced earnings for infrastructure companies. Specific infrastructure assets in which the Fund invests may be subject to additional risks relating to communication, energy, social, transportation and utilities infrastructure companies.

 

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.

 

Emerging Markets Risks. Emerging market countries may have relatively unstable governments, weaker economies and less developed legal systems with fewer securities holder rights. Emerging market economies may be based on only a few industries and security issuers may be more susceptible to economic weakness and more likely to default. Emerging market securities also tend to be less liquid.

 

Large Capitalization Risks. Larger, more established companies may be unable to respond quickly to new competitive challenges, such as changes in consumer tastes or innovative, smaller competitors. Large-cap companies are also sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion.

 

Cash and Cash Equivalents Risk. Because the Fund typically holds cash and cash equivalents the Fund risks achieving lower investment returns when the cash is not invested in securities that have appreciated in value, which could negatively impact the Fund’s performance and ability to achieve its investment objective.

 

Liquidity Risks. Liquidity risk is the risk that certain securities may be difficult or impossible to sell the quantity or sell at the time and price that MFG Asset Management would like to sell. MFG Asset Management may have to lower the price, sell other securities instead or forego an investment opportunity.

 

Cybersecurity Risks. Despite the various protections utilized by the Fund and its service providers, systems, networks, or devices utilized by the Fund can be potentially 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.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund is non-diversified, which means it may invest more of its assets in a smaller number of companies than funds that are diversified. Gains or losses on a single stock may have greater impact on the Fund than for funds that invest in a greater number of companies.
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, which is one indication of the risks of investing in the Fund. The bar chart shows the Fund’s performance for the 2019 calendar 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, 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 Returns for Institutional Class Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fund’s return from January 1, 2020, through September 30, 2020, was (11.57)%.

 

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

 

Best Quarter Return Worst Quarter Return
12.44% (1st quarter, 2019) 1.62% (3rd quarter, 2019)
Year to Date Return, Label rr_YearToDateReturnLabel The Fund’s return from January 1, 2020, through September 30, 2020, was
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (11.57%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.44%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2019
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn 1.62%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(1)  (For the periods ended December 31, 2019)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deductions for fees, expenses 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 or other tax-advantaged 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 or other tax-advantaged 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.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (For the periods ended December 31, 2019)
Frontier MFG Select Infrastructure Fund | MSCI World Index (Net) (reflects no deductions for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel MSCI World Index (Net) (reflects no deductions for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 27.67% [1]
Since Inception rr_AverageAnnualReturnSinceInception 10.70% [1],[2]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 02, 2018 [3]
Frontier MFG Select Infrastructure Fund | S&P Global Infrastructure Index  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P Global Infrastructure Index
1 Year rr_AverageAnnualReturnYear01 26.99% [1]
Since Inception rr_AverageAnnualReturnSinceInception 12.30% [1],[2]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 02, 2018 [3]
Frontier MFG Select Infrastructure Fund | Institutional Class Shares  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Redemption Fee rr_RedemptionFee $ (15.00)
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fee rr_Component1OtherExpensesOverAssets none
Additional Other Expenses rr_Component2OtherExpensesOverAssets 0.28%
Total Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.08% [4]
Less: Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.28%) [5]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement(1) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 286
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 540
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,265
Annual Return 2019 rr_AnnualReturn2019 24.87%
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.87% [1]
Since Inception rr_AverageAnnualReturnSinceInception 12.66% [1],[2]
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 02, 2018 [3]
Frontier MFG Select Infrastructure Fund | Institutional Class Shares | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 24.14% [1]
Since Inception rr_AverageAnnualReturnSinceInception 12.15% [1],[2]
Frontier MFG Select Infrastructure Fund | Institutional Class Shares | 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
1 Year rr_AverageAnnualReturnYear01 15.49% [1]
Since Inception rr_AverageAnnualReturnSinceInception 9.83% [1],[2]
Frontier MFG Select Infrastructure Fund | Service Class Shares  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Redemption Fee rr_RedemptionFee $ (15.00)
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fee rr_Component1OtherExpensesOverAssets 0.15%
Additional Other Expenses rr_Component2OtherExpensesOverAssets 0.28%
Total Other Expenses rr_OtherExpensesOverAssets 0.43%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.23% [4]
Less: Fee Waiver/Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.28%) [5]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement(1) rr_NetExpensesOverAssets 0.95%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The “Total Annual Fund Operating Expenses” and “Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement” for Service Class shares do not correlate to the “Ratio of expenses to average net assets” figures in the Financial Highlights section of this Prospectus because Service Class shares accrued shareholder servicing fees in the amount of 0.10% for the fiscal year ended June 30, 2020.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 333
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 620
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,438
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Service Class has not been offered for a full calendar year. Accordingly, the information provided represents returns of the Institutional Class.
[1] The Service Class has not been offered for a full calendar year. Accordingly, the information provided represents returns of the Institutional Class.
[2] The Institutional Class commenced operations on July 2, 2018.
[3] The Service Class has not been offered for a full calendar year. Accordingly, the information provided represents returns of the Institutional Class.
[4] The “Total Annual Fund Operating Expenses” and “Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement” for Service Class shares do not correlate to the “Ratio of expenses to average net assets” figures in the Financial Highlights section of this Prospectus because Service Class shares accrued shareholder servicing fees in the amount of 0.10% for the fiscal year ended June 30, 2020.
[5] Frontegra Asset Management, Inc. (“Frontegra”), the Fund’s investment adviser, 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, acquired fund fees and expenses (“AFFE”) and extraordinary expenses) do not exceed 0.80% and 0.95% of the Fund’s average daily net assets attributable to the 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 date of the waiver or expense payment if such reimbursement will not cause the Fund’s expense ratio to exceed the lesser of: (a) the expense limitation in place at the time of the waiver and/or expense payment; or (b) the expense limitation in place at the time of the recoupment. The expense cap/reimbursement agreement will continue in effect until October 31, 2022, and may be terminated only by, or with the consent of, the Board of Directors of the Company.