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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000795264
Thompson LargeCap Fund (Prospectus Summary) | Thompson LargeCap Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading LARGECAP FUND
Risk/Return Supplement ck0000795264_RiskreturnSupplementTextBlock

THOMPSON IM FUNDS, INC.

 

LARGECAP FUND

MIDCAP FUND

BOND FUND

 

Supplement Dated January 24, 2019 to Prospectus Dated March 31, 2018

 

Change in Expense Reimbursement for the LargeCap Fund

 

Thompson Investment Management, Inc., investment advisor to the Funds, has contractually agreed to increase the amount of expenses it will reimburse the LargeCap Fund. Effective December 1, 2018, the Advisor has contractually agreed to waive management fees and/or reimburse expenses incurred by the LargeCap Fund through March 31, 2020, so that the annual operating expenses of the LargeCap Fund do not exceed 1.03% of its average daily net assets. The previous expense limitation for the LargeCap Fund was 1.05%.

 

As a result of these changes:

 

The following table and related text on Page 3 of the Prospectus relating to the LargeCap Fund are deleted and replaced in their entirety by the following:
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)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in 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 rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Thompson LargeCap Fund (Prospectus Summary) | Thompson LargeCap Fund | Thompson LargeCap Fund  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.94%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.22%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.19%) [1]
Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements rr_NetExpensesOverAssets 1.03%
The previous expense limitation for the LargeCap Fund was 1.05%. rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Mar. 31, 2020
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 105
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 368
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 652
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,461
[1] The Advisor has contractually agreed to waive management fees and/or reimburse expenses incurred by the LargeCap Fund through March 31, 2020, so that the annual operating expenses of the Fund do not exceed 1.03% of its average daily net assets. This waiver/reimbursement may only be terminated by the Advisor with the consent of the Board of Directors of the Funds.