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Shareholder Report
 6 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name MFG Funds, Inc.
Entity Central Index Key 0001014913
Entity Investment Company Type N-1A
Document Period End Date Dec. 31, 2025
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Institutional Class  
Shareholder Report [Line Items]  
Fund Name MFG Global Sustainable Fund
Class Name Institutional Class
Trading Symbol FMSGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MFG Global Sustainable Fund for the period of July 1, 2025, to December 31, 2025.
Additional Information [Text Block] You can find additional information about the Fund at   https://mfg-funds.com/resources/. You can also request this information by contacting us at 888-825-2100.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 888-825-2100
Additional Information Website https://mfg-funds.com/resources/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Institutional Class
$42
0.80%
[1]
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.80%
Material Change Date Jun. 30, 2025
Net Assets $ 32,332,599
Holdings Count | $ / shares 28
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2025)
Net Assets
$32,332,599
Number of Holdings
28
Portfolio Turnover
27%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of net assets as of  December 31, 2025)
Top Sectors
(%)
Financials
17.1%
Information Technology
17.1%
Consumer Discretionary
17.1%
Consumer Staples
16.3%
Communication Services
10.9%
Health Care
8.3%
Real Estate
4.0%
Utilities
3.0%
Industrials
2.0%
Cash & Other
4.2%
Top 10 Issuers
(%)
Microsoft Corp.
7.9%
Amazon.com, Inc.
7.6%
Nestle SA
6.0%
Taiwan Semiconductor Manufacturing Co. Ltd.
5.2%
Mastercard, Inc.
4.7%
Meta Platforms, Inc.
4.4%
American Tower Corp.
4.0%
SAP SE
4.0%
Alphabet, Inc.
3.9%
Yum! Brands, Inc.
3.5%
Top Ten Countries
(%)
United States
66.0%
Germany
7.0%
Switzerland
6.0%
Taiwan, Province of China
5.2%
United Kingdom
4.9%
Netherlands
2.7%
Hong Kong
2.0%
Spain
2.0%
Cash & Other
4.2%
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
This is a summary of certain changes to the Fund since June 30, 2025. For more complete information, you may review the Fund’s prospectus at https://mfg-funds.com/resources/. You may also obtain a copy of the prospectus by calling 888-825-2100.
Fund Name Change
Effective October 31, 2025, the Fund’s name changed from Frontier MFG Global Sustainable Fund to MFG Global Sustainable Fund.
Investment Adviser and Subadviser Name Changes
Effective November 17, 2025, the name of the Fund’s investment adviser, Frontegra Asset Management, Inc., changed to Magellan Investment Partners North America, Inc. Effective August 15, 2025, the Fund’s subadviser changed its assumed name to Magellan Investment Partners.
Material Fund Change Name [Text Block] Effective October 31, 2025, the Fund’s name changed from Frontier MFG Global Sustainable Fund to MFG Global Sustainable Fund.
Material Fund Change Adviser [Text Block] Effective November 17, 2025, the name of the Fund’s investment adviser, Frontegra Asset Management, Inc., changed to Magellan Investment Partners North America, Inc. Effective August 15, 2025, the Fund’s subadviser changed its assumed name to Magellan Investment Partners.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund since June 30, 2025. For more complete information, you may review the Fund’s prospectus at https://mfg-funds.com/resources/. You may also obtain a copy of the prospectus by calling 888-825-2100.
Updated Prospectus Phone Number 888-825-2100
Updated Prospectus Web Address https://mfg-funds.com/resources/
Service Class  
Shareholder Report [Line Items]  
Fund Name MFG Global Sustainable Fund
Class Name Service Class
Trading Symbol FMSRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MFG Global Sustainable Fund for the period of July 1, 2025, to December 31, 2025.
Additional Information [Text Block] You can find additional information about the Fund at   https://mfg-funds.com/resources/. You can also request this information by contacting us at 888-825-2100.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 888-825-2100
Additional Information Website https://mfg-funds.com/resources/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class
$47
0.90%
[2]
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.90%
Material Change Date Jun. 30, 2025
Net Assets $ 32,332,599
Holdings Count | $ / shares 28
Investment Company Portfolio Turnover 27.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2025)
Net Assets
$32,332,599
Number of Holdings
28
Portfolio Turnover
27%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of net assets as of  December 31, 2025)
Top Sectors
(%)
Financials
17.1%
Information Technology
17.1%
Consumer Discretionary
17.1%
Consumer Staples
16.3%
Communication Services
10.9%
Health Care
8.3%
Real Estate
4.0%
Utilities
3.0%
Industrials
2.0%
Cash & Other
4.2%
Top 10 Issuers
(%)
Microsoft Corp.
7.9%
Amazon.com, Inc.
7.6%
Nestle SA
6.0%
Taiwan Semiconductor Manufacturing Co. Ltd.
5.2%
Mastercard, Inc.
4.7%
Meta Platforms, Inc.
4.4%
American Tower Corp.
4.0%
SAP SE
4.0%
Alphabet, Inc.
3.9%
Yum! Brands, Inc.
3.5%
Top Ten Countries
(%)
United States
66.0%
Germany
7.0%
Switzerland
6.0%
Taiwan, Province of China
5.2%
United Kingdom
4.9%
Netherlands
2.7%
Hong Kong
2.0%
Spain
2.0%
Cash & Other
4.2%
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
This is a summary of certain changes to the Fund since June 30, 2025. For more complete information, you may review the Fund’s prospectus at https://mfg-funds.com/resources/. You may also obtain a copy of the prospectus by calling 888-825-2100.
Fund Name Change
Effective October 31, 2025, the Fund’s name changed from Frontier MFG Global Sustainable Fund to MFG Global Sustainable Fund.
Investment Adviser and Subadviser Name Changes
Effective November 17, 2025, the name of the Fund’s investment adviser, Frontegra Asset Management, Inc., changed to Magellan Investment Partners North America, Inc. Effective August 15, 2025, the Fund’s subadviser changed its assumed name to Magellan Investment Partners.
Material Fund Change Name [Text Block] Effective October 31, 2025, the Fund’s name changed from Frontier MFG Global Sustainable Fund to MFG Global Sustainable Fund.
Material Fund Change Adviser [Text Block] Effective November 17, 2025, the name of the Fund’s investment adviser, Frontegra Asset Management, Inc., changed to Magellan Investment Partners North America, Inc. Effective August 15, 2025, the Fund’s subadviser changed its assumed name to Magellan Investment Partners.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund since June 30, 2025. For more complete information, you may review the Fund’s prospectus at https://mfg-funds.com/resources/. You may also obtain a copy of the prospectus by calling 888-825-2100.
Updated Prospectus Phone Number 888-825-2100
Updated Prospectus Web Address https://mfg-funds.com/resources/
Institutional Class  
Shareholder Report [Line Items]  
Fund Name MFG Core Infrastructure Fund
Class Name Institutional Class
Trading Symbol FMGIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MFG Core Infrastructure Fund for the period of July 1, 2025, to December 31, 2025.
Additional Information [Text Block] You can find additional information about the Fund at   https://mfg-funds.com/resources/. You can also request this information by contacting us at 888-825-2100.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 888-825-2100
Additional Information Website https://mfg-funds.com/resources/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Institutional Class
$26
0.50%
[3]
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.50%
Material Change Date Jun. 30, 2025
Net Assets $ 147,743,831
Holdings Count | $ / shares 90
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2025)
Net Assets
$147,743,831
Number of Holdings
90
Portfolio Turnover
8%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of net assets as of  December 31, 2025)
Top Sectors
(%)
Integrated Power
27.4%
Transmission & Distribution
20.5%
Toll Roads
12.0%
Airports
10.6%
Energy Infrastructure
8.2%
Communications
7.0%
Gas Utilities
6.6%
Water Utilities
5.5%
Cash & Other
2.2%
Top 10 Issuers
(%)
Aena SME SA
3.1%
Vinci SA
3.1%
Ferrovial SE
3.1%
National Grid PLC
3.1%
TC Energy Corp.
3.0%
Transurban Group
3.0%
Enbridge, Inc.
3.0%
Fortis, Inc.
2.9%
Hydro One Ltd.
2.6%
Cellnex Telecom SA
2.6%
Top Ten Countries
(%)
United States
38.6%
Canada
15.4%
Spain
10.3%
Italy
7.1%
United Kingdom
6.7%
France
5.7%
Australia
4.5%
Mexico
3.4%
Belgium
1.6%
Cash & Other
6.7%
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
This is a summary of certain changes to the Fund since June 30, 2025. For more complete information, you may review the Fund’s prospectus at https://mfg-funds.com/resources/. You may also obtain a copy of the prospectus by calling 888-825-2100.
Fund Name Change
Effective October 31, 2025, the Fund’s name changed from Frontier MFG Core Infrastructure Fund to MFG Core Infrastructure Fund.
Investment Adviser and Subadviser Name Changes
Effective November 17, 2025, the name of the Fund’s investment adviser, Frontegra Asset Management, Inc., changed to Magellan Investment Partners North America, Inc. Effective August 15, 2025, the Fund’s subadviser changed its assumed name to Magellan Investment Partners.
Material Fund Change Name [Text Block] Effective October 31, 2025, the Fund’s name changed from Frontier MFG Core Infrastructure Fund to MFG Core Infrastructure Fund.
Material Fund Change Adviser [Text Block] Effective November 17, 2025, the name of the Fund’s investment adviser, Frontegra Asset Management, Inc., changed to Magellan Investment Partners North America, Inc. Effective August 15, 2025, the Fund’s subadviser changed its assumed name to Magellan Investment Partners.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund since June 30, 2025. For more complete information, you may review the Fund’s prospectus at https://mfg-funds.com/resources/. You may also obtain a copy of the prospectus by calling 888-825-2100.
Updated Prospectus Phone Number 888-825-2100
Updated Prospectus Web Address https://mfg-funds.com/resources/
Service Class  
Shareholder Report [Line Items]  
Fund Name MFG Core Infrastructure Fund
Class Name Service Class
Trading Symbol FCIVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MFG Core Infrastructure Fund for the period of July 1, 2025, to December 31, 2025.
Additional Information [Text Block] You can find additional information about the Fund at   https://mfg-funds.com/resources/. You can also request this information by contacting us at 888-825-2100.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 888-825-2100
Additional Information Website https://mfg-funds.com/resources/
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment)
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class
$31
0.60%
[4]
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.60%
Material Change Date Jun. 30, 2025
Net Assets $ 147,743,831
Holdings Count | $ / shares 90
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of December 31, 2025)
Net Assets
$147,743,831
Number of Holdings
90
Portfolio Turnover
8%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (% of net assets as of  December 31, 2025)
Top Sectors
(%)
Integrated Power
27.4%
Transmission & Distribution
20.5%
Toll Roads
12.0%
Airports
10.6%
Energy Infrastructure
8.2%
Communications
7.0%
Gas Utilities
6.6%
Water Utilities
5.5%
Cash & Other
2.2%
Top 10 Issuers
(%)
Aena SME SA
3.1%
Vinci SA
3.1%
Ferrovial SE
3.1%
National Grid PLC
3.1%
TC Energy Corp.
3.0%
Transurban Group
3.0%
Enbridge, Inc.
3.0%
Fortis, Inc.
2.9%
Hydro One Ltd.
2.6%
Cellnex Telecom SA
2.6%
Top Ten Countries
(%)
United States
38.6%
Canada
15.4%
Spain
10.3%
Italy
7.1%
United Kingdom
6.7%
France
5.7%
Australia
4.5%
Mexico
3.4%
Belgium
1.6%
Cash & Other
6.7%
Material Fund Change [Text Block]
HOW HAS THE FUND CHANGED?
This is a summary of certain changes to the Fund since June 30, 2025. For more complete information, you may review the Fund’s prospectus at https://mfg-funds.com/resources/. You may also obtain a copy of the prospectus by calling 888-825-2100.
Fund Name Change
Effective October 31, 2025, the Fund’s name changed from Frontier MFG Core Infrastructure Fund to MFG Core Infrastructure Fund.
Investment Adviser and Subadviser Name Changes
Effective November 17, 2025, the name of the Fund’s investment adviser, Frontegra Asset Management, Inc., changed to Magellan Investment Partners North America, Inc. Effective August 15, 2025, the Fund’s subadviser changed its assumed name to Magellan Investment Partners.
Material Fund Change Name [Text Block] Effective October 31, 2025, the Fund’s name changed from Frontier MFG Core Infrastructure Fund to MFG Core Infrastructure Fund.
Material Fund Change Adviser [Text Block] Effective November 17, 2025, the name of the Fund’s investment adviser, Frontegra Asset Management, Inc., changed to Magellan Investment Partners North America, Inc. Effective August 15, 2025, the Fund’s subadviser changed its assumed name to Magellan Investment Partners.
Summary of Change Legend [Text Block] This is a summary of certain changes to the Fund since June 30, 2025. For more complete information, you may review the Fund’s prospectus at https://mfg-funds.com/resources/. You may also obtain a copy of the prospectus by calling 888-825-2100.
Updated Prospectus Phone Number 888-825-2100
Updated Prospectus Web Address https://mfg-funds.com/resources/
[1]
* Annualized
[2]
* Annualized
[3]
* Annualized
[4]
* Annualized