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Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000795264
Thompson Bond Fund (Prospectus Summary) | Thompson Bond Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading

Thompson Bond Fund
Investment Objective, Heading rr_ObjectiveHeading

Investment Objective.
investment Objective, Primary rr_ObjectivePrimaryTextBlock

The Bond Fund seeks a high level of current income while preserving capital.
Expense, Heading rr_ExpenseHeading

Fees and Expenses of the Bond Fund.
Expense, Narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Bond 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 33% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 33.00%
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 [Text] 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 Bond Fund normally invests at least 80% of its net assets plus any borrowing for investment purposes in a diversified portfolio of bonds, including corporate bonds of domestic issuers and of foreign issuers payable in U.S. dollars, short-term debt instruments, mortgage- and asset-related securities, bonds of foreign government issuers (including its agencies and instrumentalities) payable in U.S. dollars, and U.S. Treasury securities and other debt securities issued or guaranteed by the U.S. Government (including its agencies and instrumentalities). Although the Bond Fund invests primarily in investment-grade debt securities (i.e., those rated in the four highest rating categories by S&P, Moody's, or Fitch), it may invest up to 10% of its net assets in securities rated below investment grade (commonly referred to as “junk” or “high-yield” securities). The Bond Fund may invest up to 20% of its net assets in other non-debt securities, which include convertible bonds, common stocks and variable-rate demand notes. The dollar-weighted average portfolio maturity of the Bond Fund will normally not exceed 10 years. The Bond Fund does not purchase securities with a view to rapid turnover.

Risk, Heading rr_RiskHeading

Principal Risks of Investing in the Fund.
Risk, Narrative rr_RiskNarrativeTextBlock

Like all investments, an investment in the Bond Fund is subject to risks, and you could lose money investing in the Fund. The Fund could fail to achieve its investment objective. The Bond Fund is suitable if you are looking for current income through investment-grade debt securities.

 

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

 

Market Risk. The share price, total return and yield of the Bond Fund will fluctuate depending on changes in the fair market value and yields of the bonds in the Fund's portfolio.

 

Interest-Rate Risk. The value of bonds is affected primarily by changes in interest rates, average maturities and the investment and credit quality of the securities. A bond's fair market value increases or decreases in order to adjust its yield to current interest rate levels. A bond's yield reflects the bond's fixed annual interest as a percentage of its current price. Therefore, bond prices generally move in the opposite direction of interest rates and movements in interest rates typically have a greater effect on prices of longer-term bonds than on those with shorter maturities. Changes in prevailing interest rates will also affect the yield on shares of the Bond Fund. Interest-rate fluctuations, however, will not affect the income received by the Bond Fund from its existing portfolio of fixed-income securities (other than from variable-rate securities).

 

Credit Risk. The Bond Fund is subject to credit risk, which is the risk that the issuers of the bonds in which the Fund invests may default on interest and/or principal payments. The creditworthiness of an issuer could deteriorate because of developments affecting the issuer uniquely, industry developments or general economic conditions. Such deterioration increases the risk of default and would likely cause a decline in the bond's value.

 

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

 

Low and Below Investment Grade (High-Yield/Junk) Securities Risk. The Bond Fund can invest in securities with the lowest investment grade rating and, for up to 10% of its net assets, securities rated below investment grade (commonly referred to as “junk” or “high-yield” securities). Such securities are subject to a greater risk of issuer default or bankruptcy, lack of liquidity, and sensitivity to adverse economic events or developments specific to the issuer than are higher-rated securities. High-yield securities are considered speculative with regard to the issuer's capacity to pay interest and repay principal.

 

Prepayment Risk. Certain of the securities held by the Bond Fund may be prepaid prior to their scheduled maturity dates. Prepayment is likely during periods of falling interest rates. Risk of prepayment generally affects the price and yield of a security and its volatility because prepayment shortens the life of the security and thus the expected interest payments from that security. Prepayment will also require the Bond Fund to reinvest the proceeds in other securities, usually at lower rates and yields.

 

Foreign Issuer Risk. Some foreign issuers are subject to less stringent and less uniform regulatory, financial reporting, and accounting standards and practices than U.S. issuers. Bonds of foreign issuers are generally less liquid than those of U.S. issuers, and evidence of the Fund's ownership of bonds may be uncertain in many foreign countries. Bonds of foreign issuers in some countries may be subject to expropriation or confiscatory taxation or affected by political or social instability, war, terrorism, nationalization, or limitations on the removal of funds or other assets.

 

Convertible Debt Risk. Convertible debt securities will typically be classified as subordinated debt and, therefore, are more risky than unsubordinated debt.  Subordinated debt holders are lower in the hierarchy as far as principal repayment during times of distress for the issuer.  Holders of convertible debt receive substantially lower yields to maturity in comparison to the non-convertible equivalent. 

 

Common Stock Risk. Common stocks fluctuate in value for various reasons, including changes in the equities markets, general economic or political changes, interest-rate changes and factors particularly affecting the issues of stocks and their industries.
Risk Closing [Text Block] rr_RiskClosingTextBlock

Please see page 19 of the Prospectus for detailed information about the risks described above.
Risk, Lose Money rr_RiskLoseMoney Like all investments, an investment in the Bond 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 Bond 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 the Fund's benchmark index and a supplementary index. 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 Bond 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 the Fund’s benchmark index and a supplementary index.
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

Bond Fund Calendar Year Total Returns
Bar Chart, Closing rr_BarChartClosingTextBlock

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

 

Highest:

 15.07% (quarter ended 6/30/09)

Lowest:

-9.87% (quarter ended 9/30/08)

Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns (for the periods ended December 31, 2013) 
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes reflects no deductions 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.

 

Barclays® is a trademark of Barclays Bank PLC.

 

The Bond Fund's annualized yield for the 30 days ended December 31, 2013 was 2.93%. For current yield information, please call 1-800-999-0887 or visit our website at www.thompsonim.com.
Thirty Day Yield Caption rr_ThirtyDayYieldCaption The Bond Fund’s annualized yield for the 30 days ended December 31, 2013 was 2.93%. For current yield information, please call 1-800-999-0887 or visit our website at www.thompsonim.com.
Thirty Day Yield Phone rr_ThirtyDayYieldPhone 1-800-999-0887
Thirty Day Yield rr_ThirtyDayYield 2.93%
Thompson Bond Fund (Prospectus Summary) | Thompson Bond Fund | Barclays U.S. Govt./Credit 1-5 year Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays U.S. Govt./Credit 1-5 year Index (reflects no deductions for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 0.29%
5 Years rr_AverageAnnualReturnYear05 2.86%
10 Years rr_AverageAnnualReturnYear10 3.41%
Thompson Bond Fund (Prospectus Summary) | Thompson Bond Fund | Barclays U.S. Credit 1-5 year Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays U.S. Credit 1-5 year Index (reflects no deductions for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 1.24%
5 Years rr_AverageAnnualReturnYear05 5.67%
10 Years rr_AverageAnnualReturnYear10 4.15%
Thompson Bond Fund (Prospectus Summary) | Thompson Bond Fund | Thompson Bond 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 0.60%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.14%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.74%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 76
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 237
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 411
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 918
Annual Return 2004 rr_AnnualReturn2004 3.14%
Annual Return 2005 rr_AnnualReturn2005 (0.06%)
Annual Return 2006 rr_AnnualReturn2006 5.70%
Annual Return 2007 rr_AnnualReturn2007 5.67%
Annual Return 2008 rr_AnnualReturn2008 (2.10%)
Annual Return 2009 rr_AnnualReturn2009 24.83%
Annual Return 2010 rr_AnnualReturn2010 7.31%
Annual Return 2011 rr_AnnualReturn2011 3.04%
Annual Return 2012 rr_AnnualReturn2012 9.34%
Annual Return 2013 rr_AnnualReturn2013 2.82%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.07%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (9.87%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 2.82%
5 Years rr_AverageAnnualReturnYear05 9.18%
10 Years rr_AverageAnnualReturnYear10 5.75%
Thompson Bond Fund (Prospectus Summary) | Thompson Bond Fund | Thompson Bond Fund | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 1.19%
5 Years rr_AverageAnnualReturnYear05 7.57%
10 Years rr_AverageAnnualReturnYear10 4.04%
Thompson Bond Fund (Prospectus Summary) | Thompson Bond Fund | Thompson Bond 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 1.63%
5 Years rr_AverageAnnualReturnYear05 6.61%
10 Years rr_AverageAnnualReturnYear10 3.83%