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Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000795264
Thompson MidCap Fund (Prospectus Summary) | Thompson MidCap Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading THOMPSON MIDCAP FUND
Investment Objective, Heading rr_ObjectiveHeading Investment Objective
Investment Objective, Primary rr_ObjectivePrimaryTextBlock

The Thompson MidCap Fund (the “MidCap Fund”) seeks a high level of long-term capital appreciation by investing in securities of medium-sized companies.
Expense, Heading rr_ExpenseHeading Fees and Expenses of the MidCap Fund
Expense, Narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the MidCap Fund.
Shareholder Fees, Caption rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover 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 the most recent fiscal year, the Fund's portfolio turnover rate was 30% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 30.00%
Expense Example, Heading rr_ExpenseExampleHeading Example
Expense Example, Narrative 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:
Investment Strategy, Heading rr_StrategyHeading Principal Investment Strategies of the Fund
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

The MidCap Fund normally invests at least 80% of its net assets plus any borrowing for investment purposes in a diversified portfolio of equity securities of medium-sized companies that at the time of purchase fall within the 12-month average of the capitalization ranges of stocks in the Russell Midcap Index, the Fund's benchmark. Although market capitalizations are constantly changing, as of December 31, 2018, the Russell Midcap Index included companies with market capitalizations between $204 million and $33 billion. The Fund's equity investments included within this 80% may include common stocks, American Depositary Receipts (ADRs), and real estate investment trusts (REITs).

 

We invest in equity securities that possess most of the following characteristics:

 

•      Strong market positions

•      High barriers to entry and other competitive or technological advantages

•      High returns on equity and assets

•      Good growth prospects

•      Strong management

•      Relatively low debt burdens

 

We also generally seek to identify investment opportunities in equity securities of companies that we believe have above-average potential for earnings and dividend growth.

 

To achieve a better risk-adjusted return on its equity investments, the MidCap Fund invests in a diversified portfolio of companies, including companies from a blend of industries and style classes. We believe that holding a diverse group of stocks will provide competitive returns under different market environments relative to more narrow investment styles. Our flexible approach to equity investing enables us to adapt to changing market trends and conditions and to invest wherever we believe opportunity exists.
Risk, Heading rr_RiskHeading Principal Risks of Investing in the Fund
Risk, Narrative rr_RiskNarrativeTextBlock

Like all investments, an investment in the MidCap Fund is subject to risks, and you could lose money investing in the Fund. The Fund could fail to achieve its investment objective. The MidCap Fund is suitable if you are looking for capital appreciation by investing in a diverse group of medium-sized companies and have a long-term perspective.

 

An investment in the MidCap Fund typically is subject to the following principal risks:

 

Market Risk. The value of equity securities in the Fund's portfolio may decline, resulting in a decline in the Fund's share price and total return. The equity securities held by the MidCap Fund fluctuate in value due to changes in the securities markets, general economic conditions and factors that particularly affect the issuers of these securities and their industries.

 

Mid Cap Risk. The medium-sized companies in which the MidCap Fund invests often have greater price volatility, lower trading volume and less liquidity than larger, more-established companies. As a class, medium-sized companies tend to have smaller revenues, narrower product lines, less management depth and experience, smaller shares of their product or services markets, fewer financial resources and less competitive strength than larger companies.

 

Style Risk. From time to time, we may prefer a certain investment style, such as a growth style or value style, that may underperform and/or be more volatile than other investment styles or than the stock markets generally during these periods.

 

Active Management Risk. Our selection of securities for the MidCap Fund may not perform as well as expected when those securities were purchased or as well as the securities markets generally. The selection of securities for the MidCap Fund may be more or less heavily allocated to some sectors or types of securities than the Fund's benchmark, which may cause the Fund's performance and/or risk profile to differ significantly from its benchmark.

 

Depositary Receipts Risk. American Depositary Receipts (“ADRs”) are subject to some extent to the risks associated with directly investing in securities of foreign issuers, including the risk of changes in currency exchange rates, expropriation or nationalization of assets, and the impact of political, diplomatic, or social events.

 

Real Estate Investment Trusts. Real Estate Investment Trusts (“REITs”) depend on specialized management skills and may have limited diversification and smaller market capitalizations.
Risk, Closing rr_RiskClosingTextBlock Please see page 21 of the Prospectus for detailed information about the risks described above.
Risk, Lose Money rr_RiskLoseMoney Like all investments, an investment in the MidCap Fund is subject to risks, and you could lose money investing in the Fund.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading Past Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the MidCap Fund by showing how the Fund's total returns before taxes have varied from year to year and how the Fund's average annual total returns (both before and after taxes) for one, five and ten years compare to a broad measure of market performance. As with all mutual funds, the Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the MidCap Fund by showing how the Fund’s total returns before taxes have varied from year to year and how the Fund’s average annual total returns (both before and after taxes) for one, five and ten years compare to a broad measure of market performance.
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, the Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart, Heading rr_BarChartHeading MidCap Fund Calendar Year Total Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

The Fund's highest/lowest quarterly results during this period were:

 

Highest:

 23.63%

(quarter ended 6/30/09)

Lowest:

-22.19%

(quarter ended 12/31/18)
Performance Table, Heading rr_PerformanceTableHeading MidCap Fund Average Annual Total Returns (for the periods ended December 31, 2018)
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses, or taxes
Performance Table, Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are 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 shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table, Closing rr_PerformanceTableClosingTextBlock

After-tax returns are 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 shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

 

FTSE Russell is the source and owner of the trademarks, service marks, and copyrights related to the Russell Indexes. “FTSE®” and “Russell®” are trademarks of the London Stock Exchange Group.
Thompson MidCap Fund (Prospectus Summary) | Thompson MidCap Fund | Russell Midcap Index  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell Midcap Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (9.06%)
5 Years rr_AverageAnnualReturnYear05 6.26%
10 Years rr_AverageAnnualReturnYear10 14.03%
Thompson MidCap Fund (Prospectus Summary) | Thompson MidCap Fund | Thompson MidCap Fund  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFee none
Exchange Fee rr_ExchangeFee none
Maximum Account Fee rr_MaximumAccountFee none
Outgoing Wire Transfer Fee rr_ShareholderFeeOther $ 15.00
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.42%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.42%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.27%) [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.15%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 31, 2020
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 117
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 423
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 751
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,679
Annual Return 2009 rr_AnnualReturn2009 46.91%
Annual Return 2010 rr_AnnualReturn2010 25.59%
Annual Return 2011 rr_AnnualReturn2011 (5.17%)
Annual Return 2012 rr_AnnualReturn2012 17.51%
Annual Return 2013 rr_AnnualReturn2013 36.38%
Annual Return 2014 rr_AnnualReturn2014 10.99%
Annual Return 2015 rr_AnnualReturn2015 (9.49%)
Annual Return 2016 rr_AnnualReturn2016 19.38%
Annual Return 2017 rr_AnnualReturn2017 17.07%
Annual Return 2018 rr_AnnualReturn2018 (21.78%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.63%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.19%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (21.78%)
5 Years rr_AverageAnnualReturnYear05 1.89%
10 Years rr_AverageAnnualReturnYear10 11.90%
Thompson MidCap Fund (Prospectus Summary) | Thompson MidCap Fund | Thompson MidCap Fund | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (23.06%)
5 Years rr_AverageAnnualReturnYear05 0.11%
10 Years rr_AverageAnnualReturnYear10 10.19%
Thompson MidCap Fund (Prospectus Summary) | Thompson MidCap Fund | Thompson MidCap Fund | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (12.00%)
5 Years rr_AverageAnnualReturnYear05 1.51%
10 Years rr_AverageAnnualReturnYear10 9.97%
[1] The Advisor has contractually agreed to waive management fees and/or reimburse expenses incurred by the MidCap Fund through March 31, 2020, so that the annual operating expenses of the Fund do not exceed 1.15% 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.