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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Jun. 11, 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 Jun. 11, 2019
Document Effective Date dei_DocumentEffectiveDate Jun. 11, 2019
Prospectus Date rr_ProspectusDate Oct. 31, 2018
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Frontier MFG Core Infrastructure Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Frontier MFG Core Infrastructure Fund
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
FRONTIER FUNDS, INC.
 
Supplement to Prospectus Dated October 31, 2018
Frontier MFG Core Infrastructure Fund
Institutional Class Shares (FMGIX)
Service Class Shares (FCIVX)
 
The Board of Directors (the “Board”) of Frontier Funds, Inc. (the “Company”) has approved a reduced advisory fee for the Frontier MFG Core Infrastructure Fund (the “Fund”).  Effective July 1, 2019, the investment advisory fee that the Fund pays to Frontegra Asset Management, Inc. (“Frontegra”), the Fund’s investment adviser, will be reduced from an annual rate of 0.70% of the average daily net assets of the Fund to an annual rate of 0.50% of the average daily net assets of the Fund.  In addition, the Board approved an amended and restated expense cap agreement between Frontegra and the Company, on behalf of the Fund, pursuant to which the net expense ratio for each share class of the Fund will be reduced, effective July 1, 2019.  Under the amended agreement, Frontegra has 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 and extraordinary expenses) do not exceed 0.50% and 0.65% of the Fund’s average daily net assets attributable to Institutional Class and Service Class shares, respectively.  The expense cap agreement will continue in effect until October 31, 2021.
 
This supplement should be retained with your Prospectus for future reference.
Frontier MFG Core Infrastructure Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMGIX
Frontier MFG Core Infrastructure Fund | Service Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FCIVX