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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Jun. 30, 2019
Entity Registrant Name dei_EntityRegistrantName FRONTIER FUNDS, INC.
Entity Central Index Key dei_EntityCentralIndexKey 0001014913
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Dec. 23, 2019
Document Effective Date dei_DocumentEffectiveDate Dec. 23, 2019
Prospectus Date rr_ProspectusDate Oct. 28, 2019
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Frontier MFG Global Plus Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Frontier MFG Global Plus Fund
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
FRONTIER FUNDS, INC.
Frontier MFG Global Plus Fund
Institutional Class Shares (FMGPX)
Service Class Shares (FMPSX)
Class Y Shares (FMGYX)
Supplement dated December 23, 2019, to the Prospectus dated October 31, 2019
The table and related disclosure under “Summary Section — Fees and Expenses of the Fund” is hereby deleted and replaced with the following:
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 10/31/2021
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 other 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 does not include AFFE.
Supplement Closing [Text Block] ck0001014913_SupplementClosingTextBlock
PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE
Frontier MFG Global Plus Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMGPX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Redemption Fee rr_RedemptionFee $ (15.00)
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Component1 Other Expenses rr_Component1OtherExpensesOverAssets none
Component2 Other Expenses rr_Component2OtherExpensesOverAssets 0.09% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.92% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.83% [2]
Frontier MFG Global Plus Fund | Service Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMPSX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Redemption Fee rr_RedemptionFee $ (15)
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Component1 Other Expenses rr_Component1OtherExpensesOverAssets 0.15%
Component2 Other Expenses rr_Component2OtherExpensesOverAssets 0.09% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.07% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.98% [2]
Frontier MFG Global Plus Fund | Class Y  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMGYX
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Redemption Fee rr_RedemptionFee $ (15)
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Component1 Other Expenses rr_Component1OtherExpensesOverAssets 0.15%
Component2 Other Expenses rr_Component2OtherExpensesOverAssets 0.09% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.32% [3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.23% [2]
[1] Class Y shares had not commenced operations as of June 30, 2019. Accordingly, “Additional Other Expenses” for the Class Y shares are estimated based on other expenses of the Institutional Class shares of the Fund for the fiscal year ended June 30, 2019.
[2] Acquired Fund Fees and Expenses (“AFFE”) are fees and expenses incurred by the Fund in connection with its investments in other 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 does not include AFFE.
[3] The “Total Annual Fund Operating Expenses” and “Total Annual Fund Operating Expenses After Fee Waiver” 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 0.09% for the fiscal year ended June 30, 2019.
[4] 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, AFFE and extraordinary expenses) do not exceed 0.80%, 0.95% and 1.20% of the Fund’s average daily net assets attributable to the 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 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, 2021 and may be terminated only by, or with the consent of, the Board of Directors of the Company.