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Frontier Netols Small Cap Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Frontier Netols Small Cap Value Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective.
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the Frontier Netols Small Cap Value Fund (the “Fund”) is 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 had a portfolio turnover rate of 25% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 25.00%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates The Service Class shares had not commenced operations as of June 30, 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 The “Total Annual Fund Operating Expenses” and “Total Annual Fund Operating Expenses After Fee Waiver” for Class Y shares do not correlate to the “Ratio of expenses to average net assets” figures in the Financial Highlights section of this Prospectus because Class Y shares did not accrue any Distribution (12b-1) Fees or Shareholder Servicing Fees during the fiscal year ended June 30, 2016.
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 companies with small market capitalizations.  For purposes of the 80% policy, net assets include any borrowings for investment purposes.  In constructing a portfolio for the Fund, the Fund’s subadviser, Netols Asset Management, Inc. (“Netols”), selects stocks it believes are undervalued and exhibit potential “change factor” characteristics.  Netols defines a small capitalization company as any company with a market capitalization no larger than the largest company included in the Russell 2000® Value Index at the time of initial investment.  As of September 30, 2016, the largest market capitalization of a company in the Russell 2000® Value Index was $5.48 billion and the weighted average market capitalization was $1.73 billion.  
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.


Value Investing Risks.  Netols invests in companies that it believes are undervalued.  Such companies may never increase in price or pay dividends, or may decline even further if the market fails to recognize the company’s value.


Small Capitalization Company Risks.  Securities of companies with small market capitalizations are often more volatile, less liquid and more susceptible to market pressures than larger 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.


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 Returns for Institutional Class Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fund’s return from January 1, 2016, through September 30, 2016, was 6.59%.  


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


Best Quarter Return

Worst Quarter Return

 

 

19.58% (2nd quarter, 2009)

(25.16)% (3rd quarter, 2011)
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 6.59%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.16%)
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 and Class Y 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 and Class Y 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 Netols Small Cap Value Fund | Russell 2000 Value Index Institutional Class Comparison (reflects no deductions for fees, expense or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 2000 Value Index Institutional Class Comparison (reflects no deductions for fees, expense or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (7.47%) [1],[2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.67% [1],[2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.57% [1],[2]
Frontier Netols Small Cap Value Fund | Russell 2000 Value Index Class Y Comparison (reflects no deductions for fees, expense or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 2000 Value Index Class Y Comparison (reflects no deductions for fees, expense or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (7.47%) [1],[2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.93% [1],[2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 01, 2007 [1],[2]
Frontier Netols Small Cap Value Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Redemption Fee rr_RedemptionFee $ (15.00)
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fee rr_Component1OtherExpensesOverAssets none
Additional Other Expenses rr_Component3OtherExpensesOverAssets 0.21% [3]
Total Other Expenses rr_OtherExpensesOverAssets 0.21%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.21% [4]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.11%) [5]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.10% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 362
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 643
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,446
Annual Return 2006 rr_AnnualReturn2006 16.57%
Annual Return 2007 rr_AnnualReturn2007 7.08%
Annual Return 2008 rr_AnnualReturn2008 (25.65%)
Annual Return 2009 rr_AnnualReturn2009 18.38%
Annual Return 2010 rr_AnnualReturn2010 20.81%
Annual Return 2011 rr_AnnualReturn2011 (4.60%)
Annual Return 2012 rr_AnnualReturn2012 13.57%
Annual Return 2013 rr_AnnualReturn2013 38.20%
Annual Return 2014 rr_AnnualReturn2014 5.69%
Annual Return 2015 rr_AnnualReturn2015 (6.58%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.58%) [1],[2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.13% [1],[2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.97% [1],[2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 16, 2005 [1],[2]
Frontier Netols Small Cap Value Fund | Institutional Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (10.97%) [1],[2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.49% [1],[2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.11% [1],[2]
Frontier Netols Small Cap Value Fund | Institutional Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.30%) [1],[2]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.45% [1],[2]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.66% [1],[2]
Frontier Netols Small Cap Value Fund | Service Class  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Redemption Fee rr_RedemptionFee $ (15.00)
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fee rr_Component1OtherExpensesOverAssets 0.15%
Additional Other Expenses rr_Component3OtherExpensesOverAssets 0.21% [3]
Total Other Expenses rr_OtherExpensesOverAssets 0.36%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.36% [4]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.11%) [5]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.25% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 127
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 409
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 723
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,615
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Service Class had not commenced operations as of June 30, 2016. Accordingly, the information provided represents returns of the Institutional Class and Class Y.
Frontier Netols Small Cap Value Fund | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Redemption Fee rr_RedemptionFee $ (15.00)
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Shareholder Servicing Fee rr_Component1OtherExpensesOverAssets 0.15%
Additional Other Expenses rr_Component3OtherExpensesOverAssets 0.21% [3]
Total Other Expenses rr_OtherExpensesOverAssets 0.61%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.61% [4]
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.11%) [5]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 1.50% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 153
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 486
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 855
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,892
Label rr_AverageAnnualReturnLabel Class Y Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.51%) [1],[2]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.05% [1],[2]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 01, 2007 [1],[2]
[1] The Institutional Class and Class Y commenced operations on December 16, 2005, and November 1, 2007, respectively.
[2] The Service Class had not commenced operations as of June 30, 2016. Accordingly, the information provided represents returns of the Institutional Class and Class Y.
[3] The Service Class shares had not commenced operations as of June 30, 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.
[4] The "Total Annual Fund Operating Expenses" and "Total Annual Fund Operating Expenses After Fee Waiver" for Class Y shares do not correlate to the "Ratio of expenses to average net assets" figures in the Financial Highlights section of this Prospectus because Class Y shares did not accrue any Distribution (12b-1) Fees or Shareholder Servicing Fees during the fiscal year ended June 30, 2016.
[5] 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, acquired fund fees and expenses ("AFFE") and extraordinary expenses) do not exceed 1.10%, 1.25% and 1.50% of the Fund's average daily net assets attributable to Institutional Class, Service Class and Class Y 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.